JPS62157476A - Electronic camera - Google Patents

Abstract

PURPOSE:To use the titled camera as the television camera to execute the continuous photographing by providing with the first means to recede a reflecting mirror to the outside of a finder light path and the second means to release a shutter device when the reflecting mirror is receded to the outside of the finder light path by the first means. CONSTITUTION:When an electronic view finder (EVF) or a (NTSC) adapter for fetching a color composite video signal is loaded to a signal output terminal, a detecting pin 70 or 71 is pushed in, and interlocking to this, a mirror up lever 66 is rotated in the clockwise direction against a spring 69. For such a reason, a mirror driving lever 28 is rotated through a pin 67 in the counter- clockwise direction, a mirror 21 is made forcibly to rise and an object light arrives at an aperture part 12a. Next, accompanying the electric power source switch (not shown in the figure) ON, an electromagnet 37 is conducted. Thus, a front sector 13 of a shutter is travelled, the aperture part 12a comes to be an open condition, an object light is made incident on a photographing element 11 through the same aperture 12a and through a signal processing, the motor photographing or manual photographing by EVF can be executed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention has an internal photoelectric conversion element (imaging element) that converts an image of a subject into an electrical signal, and converts it into a magnetic or Regarding electronic cameras that record still images on optical recording media, it is possible to monitor captured images on a cathode ray tube, etc. by connecting an EVF (electronic viewfinder), NTSC (color composite video signal extraction) adapter, etc. Regarding electronic cameras.

[Prior Art] In such electronic cameras, in order to achieve small size, low volume, low power consumption, and ease of focusing, a (quick) return mirror guides the photographing light to the viewfinder optical path. It is advantageous to use an optical single-lens reflex finder mechanism in which the mirror is retracted from the photographing optical path and exposes the object to the photoelectric conversion element.

[Problems to be Solved by the Invention] However, electronic viewfinders are superior in that they allow direct monitoring of photographing signals (signals for still image recording). Furthermore, the signal from the image sensor in an electronic camera can easily be converted into a television signal, for example, and therefore, the electronic camera can be used as a television camera for continuous shooting by connecting it to an external VTR device or the like. Is possible.

The apparatus includes a first means for retracting the mirror, and a second means for opening a shutter device when the reflecting mirror is retracted out of the finder optical path by the first means.

[Function] It is evacuated to the outside of the inner optical path, and the shutter device can also be opened.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a signal output terminal portion of an electronic camera body according to the present invention.

In the diagram, 1 is the rear contact of the EVF connector, 2 is the NT
This is the female contact of the SC adapter connector. 70
71 is a detection bin placed in the rare contact 1 of the EVF connector, and 71 is a detection bin placed in the rare contact 2 of the NTSC adapter connector.
The male contacts (not shown) of the F and NTSC adapters are pushed in when connected.

FIG. 2 is a perspective view showing the main parts of an exposure device of an electronic camera using a CCD as a solid-state image sensor.

In the figure, reference numeral 11 indicates a solid-state imaging device such as a CCO, and an imaging signal obtained by this solid-state imaging device 11 is converted into a video signal by a well-known signal processing circuit. 12 is a shutter substrate. An aperture opening 12a is formed in the shutter substrate 12, and a leading shutter blade 13 and a trailing blade 14 run on the front surface of the aperture opening 12a. These blades form a parallel ring mechanism with arms Is, 16 and 17.18 rotatably provided on the shutter base plate 12, and are moved by the urging force of a shutter blade drive spring (not shown). Since this is a well-known structure, details will be omitted here. In addition, when the drive spring (not shown) is fully charged as shown in FIG. The engagement is released by energizing the electromagnet, and the subsequent force of the spring causes the shutter blades 13 and 14 mentioned earlier to be released.
is now running.

20 is a switch provided on the shutter board 12 for generating a shutter travel completion signal;
When the arm 17 completes its travel for exposure (the trailing blade 14 comes to the position of the leading blade 13 in FIG. 2), one end 17b of the arm 17
Therefore, the contact pieces 20a and 20b are electrically connected.

Reference numeral 19 designates a shutter activation lever rotatably supported by the shutter base plate 12, and its -branch 19a engages with one branch 24b of the main drive lever 24, which will be described later, and the other branch 19a engages with one branch 24b of the main drive lever 24, which will be described later.
9b and 19c engage with the bins 15a and 17a installed on the arm 15.17 mentioned above, and store the energy of the shutter blade drive spring mentioned above.

Reference numeral 21 denotes a total reflection mirror, which guides a luminous flux from a photographing lens (not shown) to the finder when not photographing. Further, the mirror 21 is rotatable about a shaft 22. Reference numeral 21a denotes a mirror drive bin installed in the mirror 21.

Reference numeral 23 denotes a substrate on which levers and the like for driving the mirror, which will be described later, are provided. The main drive lever 2 is biased counterclockwise by a spring 25 around a shaft 24a on the base plate 23.
4 is rotatably supported on a shaft, and a mirror drive lever 28 biased clockwise by a spring 29 is also supported on a shaft 24a. One branch 28 a of the mirror drive lever 28
is engaged with the mirror drive bin 21a mentioned above, and the mirror 21
Rotate clockwise around the shaft 22.

The return lever 30 is rotatably supported by @30a installed on a branch 24b of the main drive lever 24.
The bent portion 30b is biased clockwise by a spring 31 fixed at one end to the mirror drive lever 28, and its bent portion 30b is engaged with the tension portion 28b of the mirror drive lever 28 in the fully biased state shown in FIG. The tensioning lever 26 is rotatably supported by a shaft 26a implanted in the base plate 23, and biased clockwise by a spring 27.
In the state shown in the figure, the hook portion 28b and the hook portion 24c of the main drive lever 24 described above are engaged.

The lever 32 is rotatably supported by a shaft 32a implanted in the base plate 23, biased clockwise by a spring 33, and one end 32b of the lever 32 is connected to a branch [12] of a cam lever 62, which will be described later.
1), and the other end 32c is in contact with the return lever 30.
The one end 30c of the mirror 21 is formed so that it can be engaged with the mirror 21 in an amplified (raised) state.

Furthermore, a release lever 34 is provided on the base plate 23 and is rotatably supported at @j 34 a and biased counterclockwise by a spring 35 . One end 34b of the lever 34
is in contact with one end 60b of a switch lever 60, which will be described later, and is configured so that when the mirror 21 mentioned above rises, its one end 34c is pushed by the mirror drive pin 21a and rotated clockwise.

The switch 64 switches the mirror 2 when the mirror 21 is raised.
The contact piece 64a is driven by the bottle 21b installed in the mirror 1, and conducts with the contact piece 64b, thereby generating a mirror raising completion signal.

On the substrate 36, there is an electromagnet 37 for guiding the mirror etc.
is provided. The electromagnet 37 is composed of a permanent magnet and a coil, and is configured to reduce the attractive force of the permanent magnet by passing a current through the coil.

The accumulating lever 38 is rotatably supported by a shaft 38a embedded in the base plate 36, and its tip 38b is pressed against a bottle 56c of a main accumulating lever 56, which will be described later, when accumulating energy. Rotate the lever 38 counterclockwise.

Further, the tip portion 38b is a branch 24 of the main drive lever 24.
d.

The start lever 41 is rotatably supported by a shaft 41a embedded in the base plate 36, biased clockwise by a rough spring 42, and has an attraction piece 43 of the electromagnet 37 at one end thereof. It is equipped. Further, in the state shown in FIG. 2, the attraction piece 43 is attracted to the electromagnet 37. Further, one branch 41b of the start lever 41 is adapted to engage with a bottle 38c installed in the aforementioned energy storage lever 38, and another branch 41c can be engaged with one end 26c of the tension lever 26. There is.

Reference numeral 51 denotes a motor for accumulating energy in each of the mechanisms described above, and the driving force of the motor 51 is transmitted to the gear 5 via a gear train 52.
3. A shaft 54 rotatably supported by a camera body (not shown) has the gear 53. Cams 55, 57 and 58 are integrally connected.

The main energy storage lever 56 is rotatably supported by the camera body around @56a, and is biased counterclockwise by a spring (not shown), which is attached to the lever 56. The cam follower bin 56b is configured to abut against the cam 55. When the cam 55 rotates clockwise and the main accumulating lever 56 also rotates clockwise, the accumulating lever 38 is rotated counterclockwise via the pin 56c.

The switch lever 60 is biased clockwise by a spring 61 about a shaft 65, and its tip 60a is pressed against the outer periphery of the cam 57. Further, the other end 60b is in contact with one end 34b of the release lever 34 described above. Further, the switch lever 60 includes a switch drive bin 60c.
is planted, and as described later, the contact piece 6 of the switch 63
3a, l13b and 63c.

The cam 57 fixed to the aforementioned shaft 54 has a recess 57a.
As shown in FIG. 2, when the exposure mechanism section is fully charged, the switch lever 60 is
The distal end portion 60a falls into (fits into) the recess 57a.

The lever 62 has the same shaft 65 as the switch lever 60 mentioned above.
The branch 62a is rotatably supported on the shaft 54.
The other branch 62b is pressed by the protrusion 58a of the cam 58 provided on the lever 32, and the other branch 62b is pressed by the -branch 32b of the lever 32.
It is connected with.

Reference numeral 66 denotes a mirror up lever, which is rotatably supported by a shaft 68 embedded in the base plate 36, and which is supported by a spring 6.
9 in the counterclockwise direction, and its - branch 66a is connected to the detection bin 70 of the EVF connector and the NTSC
The lever 66 is pushed by the detection bin 71 of the adapter connector, and when either of the detection bins 70 or 71 is pushed in, the lever 66 is rotated clockwise. A bottle 67 is installed in a branch 66b of the lever 66, and when the lever 66 rotates clockwise, it engages with a branch 28c of the mirror drive lever 28 and forces the mirror drive lever 28 counterclockwise. Rotate it. Furthermore, when both the bins 70 and 71 are not pushed in, the mirror up lever 66 contacts a stopper (not shown), and the bin 67 is retracted to a position where it does not come into contact with the one branch 28c.

The switch 63 is connected to the switch lever 60 as shown in FIG.
When the tip 60a falls into the recess 57a of the cam 57, the contact pieces 63a, 63b and 63c are closed to each other, and the electrodes of the motor 51 are short-circuited at the contact pieces 63a and 63b, stopping the motor 51. Contact piece 6
3b and 63c generate an energy storage completion signal.

Next, the operation of the exposure mechanism having such a configuration will be explained.

First, the operation when the EVF and NTSC adapter connector are not attached will be explained.

When the electromagnet 37 is energized in the state where the energy storage is completed as shown in FIG.
Rotate the tension lever 26 counterclockwise at the part 1c.

By this rotation, the engagement between the hook portion 28b and the hook portion 24c of the main drive lever 24 is released, and the main drive lever 24 is rotated counterclockwise by the biasing force of the spring 25. During this rotation, the tension portion 28b of the mirror drive lever 28 and the engagement portion 30b of the return lever 30 remain engaged, so the mirror drive lever 28 rotates counterclockwise together with the main drive lever 24. Then, the mirror 21 is rotated and raised via the bottle 21a installed in the mirror 21. mirror 2
1 further rotates upward, and when it reaches the final step, the switch lever 60 is rotated counterclockwise via the release lever 34 by the bottle 21a, and the tip 60a and the cam 57 are rotated.
is disengaged from the recess 57a. At this point switch 6
The contact pieces 63a, 63b, and 63c of 3 are open to each other.

Next, the leading blade 13 of the shutter is moved in synchronization with the transfer period of the image sensor 11, and the rear blade 14 is moved after a certain predetermined time, thereby ending the exposure of the image sensor 11.

When the trailing blade 14 completes its travel and a video signal is further recorded on the magnetic disk, the motor 51 starts to be energized and the shaft 54 starts rotating clockwise. At this point, as shown in FIG. 4, the cam lever 6
The second branch 62a is pressed, causing the lever 62 to rotate clockwise in FIG. 4, and the other branch 62b to rotate the lever 32 counterclockwise in FIG. This rotation causes the return lever 30 to move through the other branch 32c of the lever 32.
One end 30c of the lever is pushed down and rotated counterclockwise, and furthermore, the engagement between the bent portion 30b and the tensioning portion 28b of the mirror drive lever 28 is released. As a result, the mirror drive lever 28 is rotated clockwise by the biasing force of the spring 29, and the mirror 21 is also returned to the position shown in FIG. motor 5
5 continues, and when the shaft 54 makes one revolution, the state shown in FIG. 2 is reached, and the motor 51 stops.

During this time, the cam 55 causes the main storage lever 56 to move into the bin 58c.
The energy accumulating lever 38 is rotated via the tip 38b, and the main drive lever 24 and the start lever 41 are energized by the tip 38b and the start lever 41, respectively, to the state shown in FIG. 2. Further, the shutter is also energized by the branch 24b of the main drive lever 24.

Next, connect the EVF or NT to the signal output terminal of the camera body.
The operation when the SC adapter is installed will be explained.

When the EVF or NTSC adapter is attached to the signal output terminal in the state shown in FIG. be rotated. Therefore, the mirror drive lever 28 is rotated counterclockwise via the bin 67, and the mirror 21 is forcibly raised.
The object light reaches the aperture opening 12a. In this state, the engagement between the bent portion 30b of the return lever 30 and the tension portion 28b of the mirror drive lever 28 is released. Therefore, it is possible to operate and charge the shutter while the mirror is up.

Next, as the power switch (not shown) is closed, the electromagnet 3
7 is energized. As a result, the leading blade 13 of the shutter
runs, the aperture opening 12a becomes open,
Subject light enters the image sensor 11 through the aperture 12a, and undergoes signal processing as described below, allowing for monitoring or photography using the EVF.

Further, when the power switch is opened, the motor 51 is energized within a predetermined time period during which the power is held, charging the shutter and closing the aperture opening 12a.

As described above, mirror-up is automatically performed by connecting the EVF or NTSC adapter to the signal output terminal.

Further, when the power switch is closed, the shutter is opened, and when the switch is opened, the shutter is closed, so that the shutter does not interfere with the use of the EVF, and moreover, the photographing elements such as the CCD are automatically protected.

In other words, with a normal camera, outdoors etc.
When carrying around, for example, strong light such as sunlight may be irradiated onto the lens, which may damage the solid-state image sensor or the color filter for color photography, but in this example, it is linked to the closing of the power switch. Since the shutter is opened by the power switch and the shutter is closed by the power switch, the solid-state image sensor, color filter, etc. are safely protected.

In addition, with the adapter connected to the signal output end of the EVF or NTS, you can open and close the power switch and open/close the electromagnet 37.
As described later, the shutter can also be opened and closed in conjunction with the release button operation after the power switch is closed, as will be described later.

FIG. 5 is a block diagram of a circuit for controlling the exposure mechanism shown in FIG. 2. In the figure, the same parts as in FIG. 2 are indicated by the same reference numerals.

In this figure, the symbols of the main parts are as follows: 1 and 2 are the rear contacts of the EVF connector and the NTSC adapter connector, 11 is the image sensor, 20 is the switch, 51 is the motor, 63 and 64 are the switches, and 201 is the image sensor 202 is a recording processing circuit that processes the signal from circuit 201 to make it suitable for recording on a magnetic disk; 203 is a gate circuit; 204 is a gate circuit; Recording amplifier; 205 is a timing signal generation circuit; 206 is an image sensor drive circuit; 207 is a control circuit (sequence controller) having a CPU, RAM, and ROM storing control procedures as shown in FIG. 6; 209 is a motor drive circuit. , 210 is the exposure system charging mechanism described above (FIG. 2) that operates in accordance with the rotation of the motor 51, 211 is a head moving mechanism, 212 is a control circuit for the motor 102, 215 is an aperture control circuit, and 21B is a shutter speed. A setting circuit 217 is a shutter control circuit.

FIG. 6 is a flowchart showing the control procedure to be executed by the control circuit 207 shown in FIG.

The control procedure in this embodiment will be described below with reference to FIGS. 5 and 6.

By turning on the power switch (not shown), the control circuit 207
Checks whether the changeover switch 222, which is turned off by turning the lever 66 to the right when the NTSC adapter or EVF connector is attached, is on (closed).
FIG. 5 step 51). If neither the NTSC adapter nor the EVF connector is attached here, and therefore the switch 222 is off, the mode is set to still (still image) recording, and the first switch 220 is closed by pressing the first stage of the release button. (Step S in Figure 5)
2) The control circuit 207 connects the switch circuit 224 to the a side and sets the control signal CT to the shutter control circuit 217 to LOW (step S in FIG. 5).
3). As a result, the aperture control circuit 215 has a measurement circuit (
The output signal from the measuring circuit 214 (including the well-known TTL 1llll optical element) is input manually, and the same circuit 215 is connected to the measuring circuit 214.
The aperture is controlled based on the output of the shutter speed setting circuit 216 and the output of the shutter speed setting circuit 216. On the other hand, when the control signal CT becomes low, the shutter control circuit 217 is set to a mode in which the shutter opening time is controlled according to the set time and time of the setting circuit 218.

Next, the control circuit 207 controls the timing signal generation circuit 2
05 and the motor control circuit 212 (step S4 in FIG. 5). As a result, the drive circuit 206 starts driving the image sensor 11, and the motor 102 starts rotating the magnetic disk 1.

Note that the motor control circuit 212 receives signals from a rotation speed detector in the motor 102 and a rotation angle (phase) detector 213.
Based on the signal from the control circuit 20, when the rotation of the magnetic disk 1 reaches a predetermined speed and a predetermined phase (relative to the vertical synchronization signal Vo from the timing signal generation circuit 205).
Set the servo lock-in signal SL manually input to 7 to high (H
IGH).

The control circuit 207 checks whether the servo lock-in signal SL is high (step S5 in FIG. 5), and if it is high, checks whether the second switch 221, which is turned on by pressing the second stage of the release button, is on. (Step S2 in Figure 5).

If the second switch 221 is on, the control circuit 207 applies a one-shot pulse to the excitation circuit 225 to
Turn on the electromagnet 25 (step S7 in Fig. 5), then turn on the electromagnet 3.
7 to perform the release. Note that the switch 64 is turned on by the mirror rising at this time, and the photometry circuit 214 stores the measured value at this time. Next, the shutter trigger signal STR is set high in synchronization with the vertical synchronization signal Vo (step S8 in FIG. 5). As a result, the shutter control circuit 217 energizes the electromagnet 218 to drive the shutter leading blade 13.
At the same time as the shutter starts running, it starts counting the shutter speed set in the shutter speed setting circuit 216, and when this set time elapses, the electromagnet 219 is energized to move the rear shutter blade 14 downward. Start running and insert the same blade 1
3. While forming a slit between 14, the same blades 13 and 14
run. The image sensor is thus exposed.

Next, the control circuit 207 turns on the gate circuit 203 for one field (Fd) period in synchronization with the next vertical synchronization signal vO (step S9 in FIG. 5). As a result, one field worth of video signal from the recording processing circuit 202 is recorded on the magnetic disk 301 via the recording amplifier 204 and the recording head 105. Note that the rotational speed of the magnetic disk 301 corresponds to the field rate. Further, the maximum open time of the shutter corresponds to the l field period.

Next, the control circuit 207 turns on the motor drive circuit 209 (step 510 in FIG.
Feeding by the track pitch and charging of the exposure system are performed.

On the other hand, in step Sl, if the switch 222 is not turned on (the mirror 21 has been raised by the lever 66 so as to be removed from the finder optical path), the control circuit 207 connects the switch circuit 224 to the b side and controls the Set the signal CT to high (step 5ll in Figure 5)
. As a result, instead of the photometry circuit 214, the ALC circuit 223 that outputs photometry information corresponding to brightness based on the brightness signal Y from the imaging signal processing circuit 201 is replaced by the aperture control circuit 215.
On the other hand, the shutter control circuit 217 is set to a mode in which the shutter trigger signal STR from the control circuit 207 is input manually and the shutter time setting circuit 216 ignores these and maintains the shutter in the open state. Become.

Next, the control circuit 207 controls the timing signal generation circuit 20
5 is turned on (step 512 in FIG. 5), and then the shutter trigger signal STR is turned high (step 510 in FIG. 5).
). This causes the shutter control circuit 217 to control the electromagnet 2.
18 is energized to move the shutter leading blade 13 downward and open the aperture opening 12a. Thus, the video signal from the imaging signal processing circuit 201 (obtained by converting the imaging signal obtained by imaging the subject with the imaging device 11 by the imaging signal processing circuit 201) is connected to the signal output terminal 1.2. External (EVF,
Display devices such as cathode ray tubes, VTR devices, etc.).

This state is maintained until the first switch 220 is turned off based on the release of the release button.
20 is turned off (step 514 in FIG. 5), the control circuit 207 proceeds to step SIO.

[Effects of the Invention] As explained above, according to the present invention, it is possible to safely extract a video signal from an electronic camera capable of recording still images with simple operation and without damaging the image sensor, etc. .

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the signal output terminal portion of the electronic camera main body according to the present invention, FIG. 2 is a perspective view showing the main part of the exposure device of the electronic camera, and FIGS. 3 and 4 are energy storage completion signals. FIG. 5 is a block diagram of a circuit for controlling the exposure mechanism, and FIG. 6 is a flowchart showing the control procedure to be executed by the circuit. 66...Mirror up lever 70.71...Detection bin, 20? ...Control circuit. Figure 3 Figure 4

Claims (1)

[Claims] 1) An image sensor, a signal output end for guiding a video signal based on a signal from the image sensor to the outside, and a connecting means for taking out the video signal attached to the output end. and a second means for opening a shutter device when the reflecting mirror is moved out of the finder optical path by the first means. An electronic camera featuring