JP2949383B2 - Camera shutter device - Google Patents

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 for a photographic camera.

[0002]

2. Description of the Related Art As a shutter device of a photographing camera, a mechanical shutter device (hereinafter referred to as a mechanical shutter device) that mechanically determines a shutter time by operation setting.
And an electronic shutter device in which the shutter time is determined by an electrical operation. Further, some recent electronic shutter devices additionally include a mechanical shutter device that causes the shutter operation to be performed immediately when the shutter operation is not performed due to consumption of a power supply battery. However, the shutter device additionally configured as described above can only set the shutter time to about two steps.

There are various types of mechanical shutter devices, and FIG. 11 shows an example of the principle configuration thereof. In this figure, reference numeral 10 denotes a rotating cam body that rotates about a support shaft 11, and has a two-stage configuration in which a cam body 12 that operates a shutter and a cam body 13 that determines a shutter time are integrated. This rotary cam body 10 has a shutter
The locking portion 10a is rotated by the trigger lever 15 in a state where it rotates counterclockwise by the jig operation and the spring force of the charge spring 14 is stored, and the state shown in the drawing is maintained.

[0004] One end of a concave portion 12a formed around the cam body 12 is a cam portion 12b for driving a shutter curtain. That is, within the turning range of the cam portion 12b,
A starter lever 16 of the shutter first curtain and a starter lever 17 of the shutter rear curtain advance. The front and rear curtains of the shutter are locked at the positions where they are wound up by the shutter charging operation.
7 is interlockingly driven by the cam portion 12b and is turned around the support shafts 18 and 19, thereby unlocking the lock and running the curtain.

[0005] One end of a concave portion 13a formed around the cam body 13 serves as a timing cam portion 13b for determining a shutter time. That is, the cam portion 13b
The projecting portion 20a of the timing lever 20 advances into the turning area of FIG. As a result, the cam portion 13b pivots so as to push the protruding portion 20a, so that the rotating cam body 10 is braked. The start time of the shutter rear curtain is determined by the degree of this braking.

The timing lever 20 is supported by a support shaft 21 and receives a clockwise turning force by a spring, so that the projection 20a always advances into the turning area of the cam 13b. Further, a time setting lever 22 having a U-shape for determining the advance distance (advancing amount) of the projection 20a is connected to the timing lever 20. The time setting lever 22 is supported by a support shaft 23 and is constantly receiving a counterclockwise turning force by a spring. The projecting pin 2 of the timing lever 20 is inserted into the long hole 22a of the one arm.
0b enters, 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 is rotated about the support shaft 25 as a support shaft, and the time setting lever 22 is rotated left and right according to the cam shape. That is, as shown in FIG. 12, the amount of turning of the time setting lever 22 according to the rotation of the shutter time setting cam 24 is transmitted to the timing lever 20, and the amount of advance of the projection 20a is determined.

In the mechanical shutter device described above, the trigger lever 15 is pushed clockwise in conjunction with the mirror-raising lever driven by pressing the shutter button to release the lock. The rotating cam body 10 is rotated clockwise by the release of the locking, and the starter lever 16 is rotated by the cam portion 12b.
To move the front curtain of the shutter.

The rotation of the rotary cam body 10 causes the cam portion 13b to abut against the projection 20a of the timing lever 20, as can be seen from FIG. Therefore, the rotation of the rotary cam body 10 causes the cam portion 13b to push out the protrusion 20a, so that the rotation cam body 10 continues to rotate while receiving a braking force corresponding to the amount of advance of the protrusion 20a.

[0010] After extrusion more protrusion portion 20a to the cam portion 13b, rotating the cam member 10 further rotates, the cam portion 12b
, The start lever 17 is pushed to move the rear curtain of the shutter.

As described above, this mechanical shutter device has an extension amount of the projection 20a provided on the timing lever 20, that is,
The time from the travel of the shutter front curtain to the travel of the shutter rear curtain is determined according to the amount of advance of the projection 20a determined by the operation setting of the shutter time setting cam 24. As shown in FIG. 11, when the shutter time setting cam 24 is operated and set so that the projecting portion 20a of the timing lever 20 is moved out of the turning area of the cam portion 13b, the rotating cam body 10 is completely controlled. Since no power is received, the shutter speed is the fastest. The timing lever 20 is switched to a delay governor in conjunction with the shutter time setting cam 24 to respond to the time setting in a wide range up to a slow shutter time.

[0012]

The above-described mechanical shutter device has a normal shutter time stage (for example, B, 1, 2).
2, 4, 8, ... 1/1000, 1/2000, 1
/ 4000 shutter seconds), an electronic shutter control circuit for controlling the shutter time steplessly is added to this mechanical shutter device with a simple configuration in the present invention, so that the mechanical shutter function and the electronic shutter function can be set. It is an object of the present invention to develop a camera shutter device that can select a function according to a shooting situation and shoot an image.

[0013]

In order to achieve the above object, according to the present invention, a shutter is rotated by a spring force according to a shutter release, a shutter is opened at a first rotation angle, and a shutter is opened at a second rotation angle. , A timing lever which is advanced by a spring force into a cam turning area of the rotary cam body, is pushed by the cam after the shutter is opened, and withdraws from the cam turning area. And a mechanical shutter time setting mechanism for determining the amount of advance from the retreat position, and a shutter time according to the rotation time of the rotary cam body that changes according to the amount of advance of the timing lever. in There camera shutter apparatus configured to be controlled, it passes to the operating mode of the electronic shutter in accordance with timing lever operation of the shutter time setting mechanism exiting holding the cam pivot outside, Shattareri An electronic shutter control circuit starts counting the shutter time according to's, cam pivot region of the rotating cam member is controlled by the electronic shutter control circuit
With an electronic timing lever to advance and exit
The provided, under the control of the electronic shutter control circuit described above, the rotary cam after the shutter open the electronic timing lever is advanced to the cam pivot region of the upper Machinery <br/> rolling cam at count start of the shutter time delays the rotation of the body, when the electronic tone at the terminal count
The lever Suggest camera shutter device being characterized in that a structure to allow rotation of the rotary cam member so as to close the shutter by exit to the cam pivot outside.

[0014]

The above-described shutter device operates in the electronic shutter mode by operating the shutter time setting mechanism so that the timing lever is moved out of the cam rotation range of the rotary cam body. When the shutter is released in this operation mode, the rotary cam body starts rotating, the electronic shutter control circuit starts counting the shutter time, and the electronic timing lever advances to the cam turning area of the rotary cam body. Let it.

The shutter is opened by the rotation of 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 counting of the shutter time is completed, the electronic shutter control circuit controls the electronic timing lever to move out of the cam turning range. This allows
The rotating cam body starts rotating again to close the shutter.

In the above shutter device, if the shutter time setting mechanism is operated so that the timing lever is advanced to the cam turning area of the rotary cam body, the operation mode of the electronic shutter is controlled.
Mode automatically switches to the mechanical shutter operation mode,
Shutter control can be performed as in the conventional example.

[0017]

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. The same members and parts as in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

As shown, the cam body 13 of the rotary cam body 10 has a concave portion 13c formed symmetrically with the concave portion 13a.
And one end of the concave portion 13c is a cam portion 13d. Further, the protruding portion 30a of the electronic timing lever 30 is configured to move forward and backward in the turning area of the cam portion 13d. The electronic timing lever 30 is supported by a support shaft 31 and is always provided with a counterclockwise turning force by a spring. As shown in the drawing, the electronic timing lever 30 is in contact with a substantially semicircular speed control cam 32.

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

The stepping motor 36 controls power supply by an electronic shutter control circuit (not shown). The electronic shutter control circuit includes a known shutter time calculation circuit that calculates a shutter time based on brightness information, aperture information, film sensitivity information of a subject, and other exposure factors. The arithmetic circuit includes a microcomputer having a CPU and a RAM. The electronic shutter control circuit operates in conjunction with the shutter time setting cam 24.
In response to the ON signal of the mode changeover switch 38, the operation mode is set. That is, the mode changeover switch 38 is turned on by operating the shutter time setting cam 24 so that the projecting portion 20a of the timing lever 20 moves out of the turning 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 operation mode of the electronic shutter control circuit is set.

Further, the above-mentioned electronic shutter control circuit comprises:
A shutter time is calculated in response to an ON signal of a trigger switch 39 linked to the trigger lever 15. That is, when the trigger switch 39 is turned on in conjunction with the release of the lock of the trigger lever 15, the counting of the shutter time is started.

Further, the above-mentioned electronic shutter control circuit includes a drive circuit for controlling the power supply of the stepping motor 36 as shown in FIG. In this drive circuit, the shutter time calculation circuit uses the trigger switch 39
When the counting of the shutter time is started by inputting the N signal,
The stepping motor 36 is rotated clockwise by a command from the arithmetic circuit. At this time, the governing 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 in FIG. The cam portion 13d is advanced to the turning area.

When the counting of the shutter time is completed, the drive circuit receives the command from the shutter operation circuit and causes the stepping motor 36 to advance counterclockwise in the opposite direction. At this time, the electronic timing lever is rotated so that the speed control cam 32 rotates from the solid line position in FIG. 1 until the speed control cam 32 hits the stopper 34, and the protruding portion 30a moves out of the turning range of the cam portion 13d.
Turn 30 counterclockwise. (See the two-dot chain line in FIG. 1)

Next, the operation of the above-described shutter device will be described with reference to the flowchart shown in FIG. Since the operation in the mechanical shutter mode is the same as that in the conventional example, the operation in the electronic shutter mode in which the shutter time setting cam 24 is operated at the position of the maximum shutter time as shown in FIG. 1 will be described.

When the camera is released, the shutter time calculation circuit determines the ON state of the mode changeover switch 38 at the half-pressing stage (shutter button half-press), and calculates the shutter time. Further, this arithmetic circuit detects ON of the mode changeover switch 38, and
The drive circuit is controlled so as to perform clockwise rotation of. Therefore, the speed control cam 32 turns counterclockwise to the start position indicated by the solid line in FIG. 1, and the protrusion 30a of the electronic timing lever 30 advances into the turning area of the cam 13d.

When the shutter release is fully depressed, the trigger lever 15 is depressed to release the locking of the rotary cam body 10 and the trigger switch 39 is turned on. As a result, the rotating 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 move the shutter front curtain.
When the rotary cam body 10 further rotates, as shown in FIG. 4, the cam portion 13d becomes the protruding portion 30a of the electronic timing lever 30.
, The rotation of the rotary cam body 10 stops, and the start time of the rear curtain of the shutter 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 count value of the shutter time reaches the calculated value of the shutter time,
The drive circuit receives the command again from this arithmetic circuit and causes the stepping motor 36 to advance. In this case, the stepping motor 36 advances counterclockwise to rotate the speed control cam 32 in FIG.
Turn clockwise as indicated by the two-dot chain line. Than this, an electronic timing lever 30 is left-handed, as shown by the two-dot chain line in FIG. 1, the projecting portions 30 a retreats to the turning outside of the cam portion 13d.

With the above operation, the rotary cam body 10 starts rotating clockwise from the rotation position shown in FIG. 4, and when the cam portion 12b pushes the starter lever 17, the rear curtain of the shutter travels.

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

In the second embodiment, when the low-speed shutter time is set, the speed-controlling cam 3
2 at the start position of A, and B at the middle speed shutter time.
When the shutter speed is high, the camera is turned to the start position C. By doing so, the cam portion 13
As shown by a two-dot chain line, the amount of advance of the protruding portion 30a with respect to the turning area of d decreases as the high-speed shutter time becomes shorter. A wide range of shutter speeds can be created by combining the amount of advance and the motor rotation speed. 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 rotating cam body 10 does not stop but rotates at a reduced speed.

FIG. 6 is a diagram showing the principle of the construction of a shutter device according to a third embodiment. In this embodiment, the speed control cam 32 is driven by a moving coil device 40 shown in FIG. Other than that, the configuration is almost the same as that of the first embodiment. The moving coil device 40 includes the lower yoke plate 4.
1, two arc-shaped magnets 42 and 43 are fixed so as to show the polarity shown in FIG.
Two moving coils 46 and 47 fixed to a rotary shaft 45 are rotatably provided between the upper and lower yoke plates 44 and 43.

The speed control cam 32 is pivotally mounted on a rotary shaft 45 on the outer surface of the upper yoke plate 44. The speed control cam 32 is provided with a clockwise turning force by a spring, and is normally in a turning position in contact with the stopper 48 as shown in FIG. 6 as shown in FIG.

The moving coils 46, 47 of the moving coil device 40 are supplied with power by the drive circuit shown in FIG. That is, when the shutter time calculation circuit detects that the trigger switch 39 is turned on in the same manner as in the first embodiment, the moving coil device 40
The drive circuit is controlled so as to supply power. With this power supply, the moving coil device 40 rotates the speed control 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-controlling cam 32 which turns 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 has caused the front curtain of the shutter to run is stopped. Further, when the shutter time calculation circuit finishes counting the shutter time, the drive circuit is controlled so that the power supply to the moving coil device 40 is stopped. Contact 48. As a result, the protruding portion 30a of the timing lever 30 retreats out of the turning range of the cam portion 13d, and the rotation stop of the rotary cam body 10 is released. As a result, the rotary cam body 10 rotates again to run the rear curtain of the shutter.

The other operations of the third embodiment are the same as those of the first embodiment, and are the operations shown in the flowchart shown in FIG. At the end of counting the shutter time,
A reverse current is passed through the bing coil device 40,
May be quickly turned to the normal position (the contact position of the stopper -48).

FIG. 10 is a principle configuration diagram showing a fourth embodiment.
In this embodiment, the electromagnetic actuator 50 and the turning lever 5 are used.
Electronic timing lever 30 by an electromagnetic drive mechanism comprising
Are linked. In this embodiment, the support shaft 52
The swivel lever 51 that swivels about the center of the circle receives the spring force and swings as shown by the two-dot chain line in the drawing to be in the normal state. When the shutter time calculation circuit detects that the mode changeover switch 38 has been turned on, the electromagnetic actuator 50 is supplied with power by the drive circuit and pulls the turning lever 51 to the position indicated by the solid line in the drawing.

Accordingly, the electronic timing lever 30 interlocked with the turning lever 51 turns clockwise, and the protrusion 30a advances into the turning area of the cam 13d. 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 turning lever 51 returns to the normal position indicated by the two-dot chain line in response to the spring force, and the protruding portion 30a retreats from the turning area of the cam portion 13d by turning the electronic timing lever 30 counterclockwise. Other configurations and operations are the same as those of 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 operate the electronic shutter, but the time setting lever 22 is operated. By providing an operation member for turning clockwise, the electronic shutter can be switched to the operation mode of the electronic shutter while the mechanical shutter device is set to an arbitrary shutter time. In such a 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, there is provided a shutter device having a mechanical shutter function capable of setting the shutter time in multiple steps and an electronic shutter function for controlling the shutter time steplessly. Therefore, it is possible to provide a camera capable of selecting a mechanical shutter or an electronic shutter in accordance with a shooting situation, and to set a shutter time in multiple steps even when the electronic shutter becomes inoperable due to power supply battery exhaustion or the like. It is a practically convenient camera shutter device that can take a picture with an arbitrary shutter time using a mechanical shutter.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of a shutter device according to 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 an operation process of the shutter device according to the first embodiment.

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

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

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

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

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

FIG. 10 is a principle configuration diagram 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.

[Explanation of symbols]

 Reference Signs List 10 rotating cam body 12 cam body 12b cam section 13 cam body 13b, 13d cam section 15 trigger lever 16 shutter start curtain start lever 17 shutter rear curtain start lever 20 timing lever 20a protrusion 22 Time setting lever 24 Shutter time setting cam 30 Electronic timing lever 30a Projection 32 Speed control cam 36 Stepping motor 38 Mode changeover switch 39 Trigger switch 40 Moving coil device 50 Electromagnetic actuator 51 Rotation Lever

Claims (1)

(57) [Claims] 1. A rotating cam body that rotates with a spring force according to a shutter release, opens a shutter at a first rotation angle, and closes a shutter at a second rotation angle, and cam rotation of the rotation cam body. Lever that springs out of the cam swivel area after being released by the cam after opening the shutter, holds the timing lever in the retreat position, and determines the amount of advance from the retreat position. A shutter mechanism for controlling the shutter time in accordance with the rotation time of the rotating cam body that changes according to the amount of advance of the timing lever. An electronic shutter that shifts to an operation mode of the electronic shutter in accordance with the operation of the shutter time setting mechanism for retracting and holding the cam outside the cam rotation area, and starts counting the shutter time in accordance with the shutter release. A control circuit and a cam turning area of the rotary cam body controlled by the electronic shutter control circuit.
With an electronic timing lever to advance and exit
The provided, under the control of the electronic shutter control circuit described above, the rotary cam after the shutter open the electronic timing lever is advanced to the cam pivot region of the upper Machinery <br/> rolling cam at count start of the shutter time delays the rotation of the body, when the electronic tone at the terminal count
Camera shutter apparatus characterized by the lever and configured to allow rotation of the rotary cam member so as to close the shutter by exit to the cam pivot outside.