JPH04366930A - Shutter device for camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device used in a photographic camera.

0002

[Prior Art] A shutter device for a photographic camera is a mechanical shutter device (hereinafter referred to as a mechanical shutter device) that mechanically determines the shutter time according to operational settings.
There is also an electronic shutter device in which the shutter time is determined by electrical calculation. Furthermore, some of the recent electronic shutter devices are additionally configured with a mechanical shutter device that operates the shutter in an emergency when the shutter does not operate due to exhaustion of the power supply battery. However, the shutter device with this additional configuration can only set the shutter time in about two steps.

Mechanical shutter devices have various configurations, and the basic configuration of one example is shown in FIG. In this figure, reference numeral 10 denotes a rotary cam body that rotates around a support shaft 11, and has a two-tiered structure in which a cam body 12 that interlocks the shutter and a cam body 13 that determines the shutter time are integrated. This rotary cam body 10 rotates counterclockwise by the shutter charging operation, and its locking portion 10a is locked by the trigger lever 15 while the spring force of the charge spring 14 is stored, so that the state shown in the figure is achieved. I keep it.

One end of a concave portion 12a formed around the cam body 12 serves as a cam portion 12b for driving the shutter curtain. In other words, within the turning range of this cam portion 12b,
The start lever 16 of the front curtain of the shutter and the start lever 17 of the rear curtain of the shutter are advanced. Note that the front and rear curtains of the shutter are locked in the position where they are wound up by the shutter charging operation, and the above-mentioned start levers 16, 1
7 is interlocked and driven by the cam portion 12b and rotated around the support shafts 18 and 19, thereby being released from the lock and traveling in a curtain direction.

Further, one end of a concave portion 13a formed around the cam body 13 serves as a timing cam portion 13b for determining the shutter time. In other words, this cam portion 13b
The protruding portion 20a of the timing lever 20 extends into the turning area. As a result, the cam portion 13b turns so as to push out the protruding portion 20a, thereby applying braking to the rotary cam body 10, and the start point of the shutter trailing curtain is determined by the degree of this braking.

The timing lever 20 is pivotally supported by a support shaft 21 and receives a clockwise turning force from a spring, so that the protruding portion 20a is always advanced into the turning area of the cam portion 13b. The timing lever 20 also has a protrusion 2.
A dogleg-shaped time setting lever 22 for determining the advancement distance (advance amount) of 0a is connected. This time setting lever 22 is pivotally supported by a support shaft 23, and is constantly subjected to counterclockwise turning force by a spring. A protruding pin 20 of the timing lever 20 is provided in the elongated hole 22a of one arm.
b protrudes, and the protruding pin 22b of the other arm is in contact with the shutter time setting cam 24.

When the shutter time setting cam 24 is operated, the shutter time setting cam 24 rotates about a support shaft 25, and the time setting lever 22 is rotated to the left or to the right according to the shape of the cam. That is, as shown in FIG. 12, the amount of rotation of the time setting lever 22 in accordance with the rotation of the shutter time setting cam 24 is transmitted to the timing lever 20, and the amount of advancement of the protrusion 20a is determined.

[0008] The above-mentioned mechanical shutter device releases the lock by pushing the trigger lever 15 clockwise in conjunction with the mirror flip lever which is driven by pressing the shutter button. The rotating cam body 10 rotates clockwise due to this unlocking, and the cam portion 12b rotates the start lever 16.
Press to move the shutter front curtain.

As the rotating cam body 10 continues to rotate, the cam portion 13b abuts against the protruding portion 20a of the timing lever 20, as shown in FIG. Therefore, as the rotary cam body 10 rotates, the cam portion 13b acts to push out the protrusion 20a, so the rotary cam body 10 continues to rotate while receiving a braking force corresponding to the amount of advance of the protrusion 20a.

After pushing out the protruding portion 20a from the cam portion 13b, the rotary cam body 10 further rotates, and the cam portion 12b pushes the start lever 17, causing the shutter trailing curtain to travel.

[0011] In this way, this mechanical shutter device has the following characteristics:
The configuration is such that the time from the movement of the front shutter curtain to the movement of the rear shutter curtain is determined according to the amount of advance of the protrusion 20a determined by the operational setting of the shutter time setting cam 24. As shown in FIG. 11, when the shutter time setting cam 24 is operated to move the protrusion 20a of the timing lever 20 out of the rotation range of the cam portion 13b, the rotating cam body 10 is not controlled at all. Since no power is applied, the shutter time is the fastest. In addition, the timing lever 20 is switched to a delay lever in conjunction with the shutter time setting cam 24, so that it can respond to a wide range of time settings, including slow shutter times.

0012

The above-mentioned mechanical shutter device has a conventional shutter time stage (for example, B, 1, 2).
, 4, 8...1/1000, 1/2000, 1/
Therefore, in the present invention, an electronic shutter control circuit for steplessly controlling the shutter time can be added to this mechanical shutter device with a simple configuration, and the mechanical shutter function and electronic shutter function can be set. An object of the present invention is to develop a shutter device for a camera that can select and take pictures according to the shooting situation.

[0013]

[Means for Solving the Problems] In order to achieve the above object, the present invention rotates with a spring force in response to the shutter release, opens the shutter at the first rotation angle, and opens the shutter at the second rotation angle. A rotating cam body that closes the shutter, a timing lever that advances into the cam rotation area of the rotating cam body by a spring force, and is pushed by the cam and exits from the cam rotation area after the shutter is opened; The rotation time of the rotary cam body changes according to the amount of advance of the timing lever. In a camera shutter device configured to control the shutter time in accordance with Therefore, the electronic shutter control circuit starts counting the shutter time, and the electronic shutter control circuit controls the rotating cam body by moving it into the cam rotation area of the above-mentioned rotating cam body at the start of counting the shutter time. A shutter device for a camera, characterized in that it is equipped with an electronic timing lever that delays the rotation and allows a rotating cam body to rotate so as to move the rotating cam body out of the cam rotation area and close the shutter when counting is completed. suggest.

[0014]

[Operation] The above-described shutter device enters the electronic shutter operating mode by operating the shutter time setting mechanism so as to move the timing lever out of the cam rotation area of the rotating cam body. When the shutter is released in this operation mode, the rotating cam body starts rotating, the electronic shutter control circuit starts counting the shutter time, and the electronic timing lever is advanced into the cam rotation area of the rotating cam body. let

The shutter is opened by rotating the rotary cam body. Thereafter, the cam of the rotary cam body hits the electronic timing lever, and the rotation of the rotary cam body is delayed. When the shutter time has been counted, the electronic shutter control circuit controls the electronic timing lever to move out of the cam rotation area. This results in
The rotating cam body starts rotating again and closes the shutter.

[0016] In the above shutter device, if the shutter time setting mechanism is operated so as to move the timing lever into the cam rotation area of the rotating cam body, the operation mode of the electronic shutter can be changed.
automatically switches from mode to mechanical shutter mode,
Shutter control can be performed in the same manner as in the conventional example.

[0017]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a principle configuration diagram for explaining a first embodiment of a shutter device according to the present invention. Note that the same reference numerals are given to the same members and parts as in the conventional example, and the explanation thereof will be omitted.

As shown in the figure, the cam body 13 of the rotary cam body 10 has a concave portion 13c formed symmetrically with the concave portion 13a.
is provided, and one end of this concave portion 13c serves as a cam portion 13d. Further, the protruding portion 30a of the electronic timing lever 30 is moved back and forth in the rotation area of the cam portion 13d. This electronic timing lever 30 is pivotally supported on a support shaft 31, is constantly given a turning force in the counterclockwise direction by a spring, and is brought into contact with a substantially semicircular speed regulating cam 32, as shown.

The speed regulating cam 32 rotates coaxially and integrally with the interlocking gear 33, and rotates about a shaft 35 from the position shown in the figure to a range where it hits the stopper 34. The interlocking gear 33 meshes with a pinion gear 37 of a stepping motor 36.

Power supply to the stepping motor 36 is controlled by an electronic shutter control circuit (not shown). This electronic shutter control circuit includes a known shutter time calculation circuit that calculates a shutter time based on subject brightness information, aperture information, film sensitivity information, and other exposure factors. Note that the arithmetic circuit includes a microcomputer having a CPU and RAM. This electronic shutter control circuit operates a motor linked to the shutter time setting cam 24.
The operating mode is entered upon receiving the ON signal from the mode changeover switch 38. That is, the mode changeover switch 38 is turned on by operating the shutter time setting cam 24 so as to move the protrusion 20a of the timing lever 20 out of the rotation range of the cam portion 13b. In other words, by setting the mechanical shutter device to the maximum shutter speed, the mode changeover switch 38 is turned on and the electronic shutter control circuit is in the operating mode.

[0021] Furthermore, the electronic shutter control circuit described above has the following features:
The shutter time is calculated in response to an ON signal from a trigger switch 39 linked to the trigger lever 15. That is, when the trigger switch 39 is turned on in conjunction with the unlocking of the trigger lever 15, counting of the shutter time is started.

Further, the electronic shutter control circuit described above includes a drive circuit for controlling power supply to the stepping motor 36, as shown in FIG. This drive circuit is
When the shutter time calculation circuit inputs the ON signal of the trigger switch 39 and starts counting the shutter time, the stepping motor 36 is rotated clockwise according to a command from the calculation circuit. At this time, the regulating cam 32, which receives the driving force via the interlocking gear 33, turns from the position indicated by the two-dot chain line to the position indicated by the solid line shown in FIG. It is advanced into the turning area of the cam portion 13d.

Further, when the counting of the shutter time is completed, the drive circuit receives a command from the shutter calculation circuit and causes the stepping motor 36 to rotate counterclockwise, contrary to the above. At this time, the speed regulating cam 32 turns from the solid line position in FIG.
Rotate 30 to the left. (See the two-dot chain line in Figure 1)

0024
Next, the operation of the above-mentioned shutter device will be explained with reference to the flowchart shown in FIG. Note that the operation in mechanical shutter mode is the same as in the conventional example, so
The operation of the electronic shutter mode in which the shutter time setting cam 24 is moved to the maximum shutter time position as shown in FIG. 1 will be described.

When the shutter of the camera is released, the shutter time calculation circuit determines the ON state of the mode changeover switch 38 at the half-press stage (the shutter button is pressed halfway) and calculates the shutter time. Further, this arithmetic circuit detects the ON state of the mode changeover switch 38 and switches the stepping motor 36.
The drive circuit is controlled to perform clockwise rotation steps. Therefore, the speed regulating cam 32 is rotated counterclockwise to the start position shown by the solid line in FIG.

When the shutter release is fully pressed, the trigger lever 15 is pushed to release the locking of the rotating cam body 10, and the trigger switch 39 is turned on. As a result, the rotary cam body 10 rotates clockwise under the spring force of the shutter charge spring, and the cam portion 12b pushes the start lever 16 to cause the shutter leading curtain to travel. When the rotary cam body 10 further rotates, the cam portion 13d engages the protruding portion 30a of the electronic timing lever 30, as shown in FIG.
, the rotation of the rotary cam body 10 stops, and the start time of the shutter trailing curtain is adjusted.

On the other hand, when the trigger switch 39 is turned on, the shutter time calculation circuit determines that the switch 39 is turned on and starts counting the shutter time. When the shutter time count value reaches the shutter time calculation value mentioned above,
The drive circuit receives a command again from this arithmetic circuit and causes the stepping motor 36 to step. In this case, the stepping motor 36 rotates counterclockwise, and the regulating cam 32 rotates as shown in FIG.
Turn it clockwise as shown by the two-dot chain line. As a result, the electronic timing lever 30 rotates to the left as shown by the two-dot chain line in FIG. 1, and its protruding portion 13a moves out of the rotation range of the cam portion 13d.

With the above operation, the rotary cam body 10 starts rotating clockwise from the rotational position shown in FIG. 4, and when the cam portion 12b pushes the start lever 17, the shutter trailing curtain runs.

In the shutter device of the first embodiment described above,
At the end of counting the shutter time, the electronic timing lever 30 is turned counterclockwise at high speed to cope with the high shutter time, so it is necessary to speed up the counterclockwise rotation of the stepping motor 36. Therefore, this problem can be solved by determining the start position of the electronic timing lever 30 in accordance with the calculated value of the shutter time, as shown in FIG. 5 as a second embodiment.

In this second embodiment, when the shutter time is calculated to be a low speed shutter time, the speed regulating cam 3 is
2 to the start position of A, and B for medium speed shutter time.
When using a high-speed shutter time, the camera is rotated to the start position C. In this way, the cam portion 13
As shown by the two-dot chain line, the amount of advance of the protrusion 30a relative to the turning area d decreases as the shutter time increases. A wide range of shutter speeds can be created by combining this amount of advance and the motor rotational speed. Note that when the amount of protrusion of the protruding portion 30a is small, the cam portion 13d advances while sliding on the protruding portion 30a, so that the rotary cam body 10 does not stop but rotates at a reduced speed.

FIG. 6 is a diagram illustrating the principle of a shutter device according to a third embodiment. In this embodiment, the regulating cam 32 is driven by a moving coil device 40 shown in FIG. Other than this, the configuration is almost the same as that of the first embodiment. The moving coil device 40 includes a lower yoke plate 4
1, two arc-shaped magnets 42 and 43 are fixed to the magnet 42 and 43 in a manner that shows the polarity shown in the figure.
, 43 and an upper yoke plate 44, two moving coils 46 and 47 fixed to a rotating shaft 45 are rotatably provided.

The speed regulating cam 32 is mounted on a rotary shaft 45 and rotated on the outer surface of the upper yoke plate 44. A clockwise turning force is applied to this speed regulating cam 32 by a spring, and normally the cam 32 is at a turning position where it contacts a stopper 48 as shown in FIG.

The moving coils 46 and 47 of the moving coil device 40 are supplied with power by the drive circuit shown in FIG. 8 and rotate to the left. In other words, when the shutter time calculation circuit detects that the trigger switch 39 is turned on, as in the first embodiment, the moving coil device 40
control the drive circuit to supply power. This power supply causes the moving coil device 40 to rotate the regulating cam 32 counterclockwise until it comes into contact with the stopper 49.

As described above, the electronic timing lever 30 is pushed by the speed regulating cam 32 which rotates to the left, and its protruding portion 30a advances into the turning area of the cam portion 13d. In this state, the rotation of the rotary cam body that caused the shutter front curtain to travel is stopped. Furthermore, since the drive circuit is controlled to stop the power supply to the moving coil device 40 when the shutter time calculation circuit finishes counting the shutter time, the speed regulating cam 32 is rotated clockwise by the spring force, and the stopper cam 32 is rotated clockwise by the spring force. 48. As a result, the protruding portion 30a of the timing lever 30 moves out of the rotation range of the cam portion 13d, and the rotation of the rotary cam body 10 is released. As a result, the rotary cam body 10 rotates again and causes the shutter trailing curtain to travel.

The other operations of the third embodiment are similar to those of the first embodiment, and are shown in the flow chart shown in FIG. Note that at the end of shutter time counting, the motion
A reversing current is applied to the Bing coil device 40, and the regulating cam 32
It may be configured to rapidly pivot to the normal position (the contact position of the stopper 48).

FIG. 10 is a diagram showing the principle configuration of the fourth embodiment.
This embodiment includes an electromagnetic actuator 50 and a turning lever 5.
The electronic timing lever 30 is operated by an electromagnetic drive mechanism consisting of
The configuration is such that the two are linked together. In this embodiment, the support shaft 52
The pivoting lever 51, which pivots around the center, receives a spring force and pivots as shown by the two-dot chain line in the figure, and is in a normal state. The shutter time calculation circuit is set to O of the mode selector switch 38.
When N is detected, the electromagnetic actuator 50 is supplied with power by the drive circuit, and the swing lever 51 is moved to the position shown by the solid line.

[0037] Therefore, the electronic timing lever 30, which is interlocked with the turning lever 51, turns clockwise, causing its protrusion 30a to advance into the turning area of the cam part 13d. Furthermore, at the end of counting the shutter time, the driver circuit cuts off the power supply to the electromagnetic actuator 50. As a result, the swing lever 51 receives the spring force and returns to the normal position shown by the two-dot chain line in the figure, and the electronic timing lever 30 swings counterclockwise, causing the protrusion 30a to exit from the swing area of the cam portion 13d. Other configurations and operations are the same as in the first embodiment.

In the above-described embodiment, when the mechanical shutter device is set to the maximum shutter time, the mode changeover switch 38 is turned on to enter the electronic shutter operation mode. By providing an operating member that can be rotated clockwise, it is possible to switch the mechanical shutter device to the electronic shutter operation mode while the mechanical shutter device is set to an arbitrary shutter time. In this case, the mode changeover switch 38 is turned on in response to the time setting lever 22 or its operating member.

[0039]

As described above, according to the present invention, a shutter device is provided which has a mechanical shutter function that allows the shutter time to be set in multiple stages and an electronic shutter function that allows the shutter time to be controlled steplessly. Therefore, it is possible to provide a camera that allows you to select either a mechanical shutter or an electronic shutter to take pictures depending on the shooting situation, and even if the electronic shutter becomes inoperable due to exhaustion of the power supply battery, the shutter time can be set in multiple stages. This is a practically convenient camera shutter device that uses a mechanical shutter and can take pictures with any shutter time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of a shutter device showing a first embodiment of the present invention.

FIG. 2 is a block diagram for explaining an electronic shutter control circuit of the shutter device according to the first embodiment.

FIG. 3 is a flowchart showing the operation of the shutter device according to the first embodiment.

FIG. 4 is a simplified diagram showing the operation process of the shutter device according to the first embodiment.

FIG. 5 is a diagram showing the principle configuration of a shutter device showing a second embodiment.

FIG. 6 is a diagram showing the principle configuration of a shutter device according to a third embodiment.

FIG. 7 is an exploded perspective view showing a moving coil device included in a shutter device according to a third embodiment.

FIG. 8 is a block diagram for explaining an electronic shutter control circuit of a shutter device according to a third embodiment.

FIG. 9 is a flowchart showing the operation of the shutter device according to the third embodiment.

FIG. 10 is a diagram showing the principle configuration of a shutter device according to a fourth embodiment.

FIG. 11 is a simplified configuration diagram of a mechanical shutter device shown as a conventional example.

12 is an operation process diagram of the mechanical shutter device shown in FIG. 11. FIG.

[Explanation of symbols]

10 Rotating cam body 12 Cam body 12b Cam part 13 Cam bodies 13b, 13d Cam part 15 Trigger lever 16 Start lever of shutter front curtain 17 Start lever of shutter rear curtain 20 Timing lever 20a Projected part 22 Time setting lever 24 Shutter time setting cam 30 Electronic timing lever 30a Projection part 32 Speed regulating cam 36 Stepping motor 38 Mode changeover switch 39 Trigger switch 40 Moving coil device 50 Electromagnetic actuator 51 Turning lever

Claims (1)

[Claims] 1. A rotating cam body that rotates with a spring force in response to a shutter release, opens the shutter at a first rotation angle, and closes the shutter at a second rotation angle, and a cam of the rotating cam body. A timing lever that advances into the cam rotation area by spring force and is pushed by the cam and exits from the cam rotation area after the shutter is opened.
and a mechanical shutter time setting mechanism that holds the timing lever at the exit position and determines the amount of advance from the exit position, and changes depending on the amount of advance of the timing lever. In a camera shutter device having a configuration in which the shutter time is controlled according to the rotation time of a rotating cam body, an operation mode is set in accordance with the operation of the shutter time setting mechanism described above that moves the timing lever out of the cam rotation area and holds it. and an electronic shutter control circuit that starts counting the shutter time according to the shutter release, and an electronic shutter control circuit that moves the above-mentioned rotating cam body into the cam rotation area and opens the shutter when the shutter time starts counting. It is characterized by being equipped with an electronic timing lever that delays the rotation of the subsequent rotating cam body and allows the rotating cam body to rotate so as to move the cam body out of the cam rotation area and close the shutter at the end of counting. shutter device for cameras.