JPH06148717A - Shutter device - Google Patents

Abstract

PURPOSE:To prevent the shutter from being opened by external impact. CONSTITUTION:A shutter lever 3 is placed at the position displayed in the figure and is not moved when a driving pin 2b of an actuator 2 determining a focusing point position of a lens barrel is arranged between the position of the continuous line and the position of the dotted line, but when the driving pin 2b is rotated in the right direction from the position of the continuous line, the driving pin 2b gets out of a cam 3b, the shutter lever 3 is rotated in the right direction to be brought into contact with 3d, a shutter blade 11 is opened, then the shutter blade 11 is closed through the cam 3d when the driving pin 2b is rotated in the left direction after the lapse of a specified time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device for first setting a distance and then driving a shutter blade.

[0002]

2. Description of the Related Art A shutter device that automatically drives a lens in response to a release signal, sets a photographing lens at a focal position, and then drives a shutter is disclosed in Japanese Utility Model Laid-Open No. 3-222.
Known as No. 28. However, in this technique, an opening / closing lever that opens and closes the shutter blade that is biased in the opening direction is engaged and held by a locking lever, and the engagement of the locking lever is released by a rotating arm of the motor to open the shutter. The locking lever is merely biased in the engagement direction by the spring, and there is a problem that the shutter is opened by an external impact. This problem can be solved by locking the locking lever with another member and retracting the member in response to the release signal, but there is a problem that the number of members increases and the configuration becomes complicated.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention provides a shutter lever for opening and closing shutter blades, which is locked at an initial position by a drive pin of an actuator.
The cam surface and the drive pin connected to the first cam surface are the first
A second cam surface is provided which opens and closes the shutter when it is disengaged from the cam surface, and the shutter blade is controlled by this shutter lever.

[0004]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is an embodiment diagram showing a shutter closed state of a shutter device according to the present invention, and FIG. 2 is an embodiment diagram showing a shutter opened state of a shutter device according to the present invention.
Is an embodiment diagram showing an initial state of the focus setting device, and FIG. 4 is an embodiment diagram showing a state after focus setting of the focus setting device.

The main plate 1b has shutter blades 11a and 11a.
It is superposed at a predetermined interval where b is driven.

In FIG. 3, the shutter base plate 1a is provided with 2a.
An actuator 2 having a drive pin 2b that rotates about a center is provided by a method not shown. In response to the release signal, the drive pin 2b rotates left and returns to the rear initial position, and then rotates right and returns to the initial position as one cycle. When the drive pin 2b is in the initial position, both ends of the spring 4 provided in FIG. 1 are in contact with the outer periphery of the drive pin 2b.

The locking lever 6 biased counterclockwise by the spring 7 about the shaft core 6a is provided with a surface 6d which comes into contact with the claws 6b, 6c and the drive pin 2b. The rotary ring 8 is provided on the shutter base plate 1 a by being biased in the clockwise direction by a spring 9, and a lens barrel (not shown) is configured to rotate following the rotary ring 8. In the initial position of the rotary ring 8, the pawl 6b of the locking lever 6 is provided.
The locking portion 8b that is locked to the locking lever 8c and the locking portion 8c that is rotated rightward by the release signal and is locked by the claw 6c of the locking lever 6.
It is configured to rotate counterclockwise in association with film winding and return to the initial position.

A photoelectric sensor 10 for detecting opening / closing of the shutter is provided on the upper right side of the shutter base plate 1a. This photoelectric sensor is configured to detect reflected light when the shutter blade is present in the detection area.

In FIG. 1, on the rear surface of the shutter base plate 1b, there is provided a shutter lever 3 biased in a clockwise direction by a spring 5 about an axis 3c. The shutter lever 3 is provided on the base plate 1b. A cam surface 3 that comes into contact with the pin 3a and the drive pin 2b that are erected upward through the hole 14
b and 3d are provided. The cam surface 3b is formed as a surface that draws an arc of a constant distance R from the center of rotation of the drive pin 2b at the initial position. The pin 3a of the shutter lever 3 penetrates the long holes of the shutter blades 11b and 11a.

The shutter blade 11b is a shutter base plate 1b.
It is provided so that it is opened by rotating the pin 3a in the clockwise direction about the shaft core 3c with the pin 15 provided at the center as the axis. The shutter blade 11a is provided so as to be opened by the clockwise rotation of the pin 3a with a pin (not shown) provided at a position corresponding to the pin 15 as a rotation center. The opening / closing operation of the shutter blade 11a is detected by the photoelectric sensor 10.

Next, the operation of the shutter device constructed as described above will be described. In FIG. 3, the drive pin 2 of the actuator 2 responds to the operation of a release button (not shown).
b rotates counterclockwise and pushes the cam surface 6d of the locking lever 6, the locking lever 6 rotates clockwise, and the engagement between the claw 6b and the locking portion 8b of the rotary ring 8 is released. The rotating ring 8 is rotated clockwise by the stored force of the spring 9. Following the rotation of the rotary ring 8, a lens barrel (not shown) moves from the initial position toward the in-focus position and stops at the in-focus position. Although the rotating ring 8 still rotates from the stop position of the lens barrel, the claw 6c of the locking lever 6 engages the locking portion 8c of the rotating ring 8 and stops (see FIG. 4). Incidentally, it goes without saying that the position of the locking portion 8c of the rotating ring 8 is provided at an appropriate position depending on the required maximum movement amount of the lens barrel.

In FIG. 1, even if the drive pin 2b of the actuator 2 rotates counterclockwise, the shutter lever 3 maintains the position shown while being in contact with the drive pin 2b. When the lens barrel stops at the in-focus position and the locking portion 8c of the rotary ring 8 is locked by the claw 6c of the locking lever 6 (see FIG. 4), the actuator stopped at the position indicated by the phantom line in the figure. The second drive pin 2b starts rotating clockwise, passes through the position indicated by the solid line, and further rotates.

As a result, the drive pin 2b comes into contact with the cam 3d of the shutter lever 3, and the shutter lever 3 is rotated clockwise by the urging force of the spring 5. As a result, the pin 3a causes the shutter blades 11a, 11a to pass through the elongated holes.
Open b (see FIG. 2).

During the shutter opening process, the shutter blade 11a
When the tip of the sensor comes off the photoelectric sensor 10,
Sends a shutter open signal to an electric circuit (not shown).
The exposure time is measured in synchronism with this, and after the appropriate time measurement, the drive pin 2b of the actuator 2 rotates counterclockwise to return to the initial position, and the pin 3a rotates counterclockwise via the cam 3d. However, the shutter blade 11a is the photoelectric sensor 10
When it is detected by, the rotation of the drive pin 2b is stopped.

After that, the film is wound up by a mechanism (not shown), and in conjunction with this, the rotary ring 8 rotates counterclockwise to engage with the claw 6b of the locking lever 6 and the locking portion 8b of the rotary ring 8. , Return to the initial position.

[0016]

As described above, in the shutter device according to the present invention, since the shutter lever that controls the opening and closing of the shutter blade is locked by the drive pin of the actuator, it is not necessary to provide a special locking lever. With a simple structure, it is possible to prevent the shutter blade from opening due to a shock.

[Brief description of drawings]

FIG. 1 is an embodiment diagram showing a shutter closed state of a shutter device according to the present invention.

FIG. 2 is an embodiment diagram showing a shutter open state of the shutter device according to the present invention.

FIG. 3 is an embodiment diagram showing an initial state of the focus setting device.

FIG. 4 is an embodiment diagram showing a state after focus setting of the focus setting device.

[Explanation of symbols]

 1a Shutter base plate 1b Shutter base plate 2 Actuator 3 Shutter lever 4 Spring 5 Spring 6 Engaging lever 7 Spring 8 Rotating ring 9 Spring 10 Photoelectric sensor 11a Shutter blade 11b Shutter blade 12 pin 13 Lens aperture 14 Hole 15 pin

Claims (1)

[Claims] 1. A circular motion from the initial position to one and the other,
An actuator having a drive pin that returns to the initial position on the same trajectory; a first cam surface that is locked by the drive pin when the drive pin is in the initial position and during one circular movement;
A shutter lever having a second cam surface which is provided in series with the cam surface and which is driven during the forward movement to the other side and returns to the initial position by the backward movement, and the forward movement of the shutter lever opens and returns the shutter. A shutter device including: a shutter blade that is closed by a shutter; and a detection unit that detects opening and closing of the shutter blade.