JP2575245Y2 - Camera shutter drive - 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 drive device for a camera which performs exposure by opening and closing two shutter blades.

[0002]

2. Description of the Related Art In a camera having an aperture / shutter with two shutter blades, a shutter opening / closing lever is provided as a shutter driving device so as to be rotatable around a lever rotation shaft, and one of the shutter opening / closing levers on the side of one shutter. The arm is connected to the respective bases of two shutter blades provided so as to be openable and closable about the shutter rotation axis as a fulcrum, and the other driving side arm is connected to driving means. In some cases, the two shutter blades rotate to open and close the two shutter blades.

[0003] An aperture / shutter having two shutter blades is conventionally provided with a two-shutter blade in order to detect its opening state.
One of the shutter blades is used for detecting the opening state,
A photo interrupter or the like is installed in the vicinity of the movement trajectory of the shutter blade, and a detection protrusion or a hole is provided in the detection shutter blade for detection.

[0004]

In such a camera shutter driving device, the two shutter blades are moved by rotating the shutter opening / closing lever, so that the two shutter blades are accurately and evenly moved. In addition, the length of the arm on the shutter side from the lever rotation axis to the connecting portion of the base of the shutter blade is increased.

Since the shutter opening / closing lever is mounted so as to be rotatable about the lever rotation axis, a force in the direction of gravity is strongly applied to the arm on the shutter side by the lever principle, and the camera is not used during use. The aperture characteristic of the shutter blade changes due to the difference in attitude, and a stable shutter operation cannot be obtained. In addition, when the operating direction of the shutter opening / closing lever coincides with the direction of gravity, the shutter opening / closing lever becomes easy to move. For example, when a strong force such as an impulse is applied in the same direction as the direction of gravity, There is a possibility that the shutter blade may move due to malfunction of the shutter opening / closing lever. Further, in order to balance the shutter opening / closing lever with the shutter side arm, another lever arm may be provided in a direction opposite to the shutter side arm to eliminate the rotational force due to gravity. This method takes up space and increases the size of the shutter driving device.

Further, if a shutter is used as a diaphragm shutter and a detecting portion is provided on one of the shutter blades to detect the opening state, the shutter blade for detection becomes larger than the other shutter blade. Therefore, the opening characteristics of the shutter blades change due to the difference in the posture of the camera, and the driving accuracy of the shutter deteriorates.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a camera shutter driving device which can obtain a small and stable shutter operation and reduce a shutter malfunction. It is another object of the present invention to provide a shutter drive device capable of outputting a plurality of signals with high drive accuracy without increasing the size of the shutter drive device.

[0008]

According to another aspect of the present invention, a shutter opening / closing lever is provided rotatably around a lever rotation shaft, and one of the shutter opening / closing levers is provided on one shutter side. An arm is connected to each base of two shutter blades provided to be openable and closable about a shutter blade rotation axis, and the other driving side arm is connected to driving means, and the shutter opening / closing lever is driven by the driving means. A shutter driving device for rotating the shutter blades to open and close the two shutter blades, wherein the driving arm of the shutter opening / closing lever is provided with an adjusting member for balancing with the shutter arm. It is characterized by.

According to a second aspect of the present invention, in the camera shutter drive device, the adjusting member changes a mounting position on the drive side arm so that a balance with the shutter side arm can be adjusted. Features.

According to a third aspect of the present invention, there is provided a shutter driving device for a camera, wherein a detecting means for detecting an opening state by opening and closing operations of two shutter blades is provided, and the detecting means detects an opening state of the shutter blades. Detected portions are provided for each of the two shutter blades, and the opening process of the shutter blades is divided into a plurality of regions, and the detection of the plurality of regions is performed independently by the detected portions of the two shutter blades. It is characterized in that it is detected by detecting.

[0011]

According to the first aspect of the present invention, an adjusting member is provided on the driving arm to which the driving means of the shutter opening / closing lever is connected, and the adjusting member connects the shutter side to which two shutter blades are connected. Balance with arms.

According to the second aspect of the present invention, the balance with the arm on the shutter side is adjusted by changing the attachment position of the adjusting member to the lever arm.

In the invention according to the third aspect, the opening process of the shutter blade is divided into a plurality of regions by utilizing two shutter blades, and the detection of the plurality of regions is performed by the two shutter blades. The detection is performed independently in each of the detection sections.

[0014]

Embodiments of the present invention will be described below. FIG. 1 is a plan view showing a shutter closed state of a shutter drive device of a camera, FIG. 2 is a view showing a shutter open state of a shutter drive device of the camera, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, and FIG. 5 is a shutter control time chart of the shutter driving device.

This camera has an aperture / shutter with two shutter blades, and is driven by a shutter driving device of the camera. A shutter opening / closing lever 1 constituting this shutter driving device is provided with its shaft portion 1a inserted through a lever rotation shaft 2, and is rotatable around the lever rotation shaft 2. This shutter opening / closing lever 1
Is a shutter side arm 1b on one side with the shaft 1a as a base point,
On the other hand, a driving side arm 1c is provided. A shutter connecting pin 3 is provided on the shutter side arm 1b, and the shutter connecting pin 3 has bases 4a of two shutter blades 4 and 5,
They are connected to each other by inserting elongated holes 4b and 5b formed in 5a. Bases 4a, 5a of these two shutter blades 4, 5
Are openable and closable about the shutter blade rotation shafts 6 and 7, respectively.

A gear 1d is formed at the tip of the shutter-side arm 1b, and the gear 1d meshes with the gear 8a of the flywheel 8. The flywheel 8 is rotatably provided on a support shaft 9. The flywheel 8 is rotated by the opening and closing operation of the shutter opening and closing lever 1, and the opening and closing operation of the shutter opening and closing lever 1 operates stably at a predetermined speed. I am trying to do it. An opening direction restricting stopper 10 is provided on the opening side of the shutter opening / closing lever 1 with respect to the shutter side arm 1b, and a closing direction restricting stopper 1 is provided on the closing side.
1 is provided. When the shutter-side arm 1b abuts on the opening-direction restricting stopper 10, the opening direction of the shutter opening / closing lever 1 is restricted, and the closing-direction restricting stopper 1 is also controlled.
When the shutter opening / closing lever 1 is in contact with the shutter opening / closing lever 1, the closing direction of the shutter opening / closing lever 1 is regulated.

Driving arm 1 of this shutter opening / closing lever 1
A plunger connecting pin 12 is provided at c. The plunger connecting pin 12 is connected to the plunger connecting pin 12 by inserting a window 13 a of the opening / closing plate 13. The open / close plate 13 is connected to a movable iron core 15 of a solenoid plunger 14, and the movable iron core 15 is supported by a bent locking portion 13d.
A locking portion 13b is provided to be bent on the opening / closing plate 13, and one end portion 17a of the spring 17 is locked to the locking portion 13b, and the other end portion 17b is a locking portion provided to the shutter base plate. 18. The movable iron core 15 of the solenoid plunger 14 is pulled by the spring 17 and constantly biases the shutter opening / closing lever 1 in the closing direction. The shaft portion 1a of the shutter opening / closing lever 1 is attached to the plunger connecting pin 12.
One end 19a of the coil spring 19 supported by the shutter is locked, and the other end 19b is locked by a stopper 20 provided on the shutter base plate. It is urged to always contact the plunger side end 13c. The opening / closing plate 13, the movable iron core 15, the solenoid plunger 14, the spring 17, the coil spring 19, and the like constitute driving means K.

The drive arm 1c of the shutter opening / closing lever 1 is provided with an adjusting member 21 for balancing with the shutter arm 1b to which the two shutter blades 4 and 5 are connected. By providing the adjustment member 21 on the shutter side arm 1b, the shutter side arm 1b can be balanced with the shutter side arm 1b.
Without increasing the size of the shutter drive device, the movement of the two shutter blades 4, 5 is uniform and stable with high accuracy,
Further, it is possible to obtain a shutter driving device in which the shutter opening / closing lever 1 is less likely to malfunction due to the posture of the camera during use.

The two shutter blades 4 and 5 are provided with projections 4c and 5c having a predetermined width, respectively.
5c are provided on both sides of the shutter blade 4,
5 constitutes a part to be detected for detecting the state of opening. The detecting means S includes a photo interrupter 22, and is attached to the camera body by inserting a set screw 23 into a screw hole 22a of the photo interrupter 22. The photo interrupter 22 detects the opening state of the two shutter blades 4 and 5 due to the opening / closing operation thereof,
The opening process of the shutter blades 4 and 5 is divided into a plurality of regions, and the detection of the plurality of regions is divided into the detected portions of the two shutter blades 4 and 5 and detected independently.

Next, the operation of the camera shutter driving device will be described. The two shutter blades 4 of FIG.
When the solenoid plunger 14 is energized in a state where the solenoid valve 5 is closed, the movable iron core 15 is pulled against the spring 17 so that the opening / closing plate 13 moves in the direction of the arrow a. It is moved by the coil spring 19. For this reason, the shutter opening / closing lever 1 rotates in the opening direction b, and the bases 4a and 5a of the two shutter blades 4 and 5 are pulled in the arrow c direction by the shutter connecting pin 3 of the shutter side arm 1b. The two shutter blades 4 and 5 rotate in the direction of arrow d with the shutter blade rotation shafts 6 and 7 as fulcrums, and the exposure is performed with the shutter opened as shown in FIG. At this time, first, when the end A of the protrusion 4c of the shutter blade 4 passes through the photointerrupter 22, the exposure starts, and the end B of the protrusion 5c of the shutter blade 5 on the opposite side.
Pass through and further open to the end C.

When the energization of the solenoid plunger 14 is cut off, the spring 17 pulls the movable iron core 15 together with the open / close plate 13 in the direction of arrow e.
Moves against the coil spring 19. For this reason, the shutter opening / closing lever 1 rotates in the closing direction f, and the shutter connecting pins 3 cause the bases 4a and 5a of the two shutter blades 4 and 5 to move.
Is pushed in the direction of arrow g, whereby the two shutter blades 4 and 5 are pivoted about the shutter blade rotation shafts 6 and 7 as arrow h.
To the shutter direction, as shown in FIG. At this time, first, when the end B of the protruding portion 5c of the shutter blade 5 passes through the photointerrupter 22, and the end A of the protruding portion 4c of the shutter blade 4 passes through the photointerrupter 22, the exposure ends and the initial position. Return to

As described above, a detected portion for causing the photo interrupter 22 to detect the opening state of the shutter blades 4, 5 is provided for each of the two shutter blades 4, 5, and the opening process of the shutter blades 4, 5 is performed. A plurality of areas are detected, and the detection of the plurality of areas is detected separately for the detected portions of the two shutter blades 4 and 5, and the opening process from the opening start state of the shutter blades 4 and 5 to the opening completed state is performed in a plurality. And each portion is detected by different shutter blades 4 and 5. Therefore, it is possible to increase the driving accuracy and output a plurality of signals without increasing the size of the shutter.

FIGS. 5 and 6 show another embodiment of the camera shutter driving device. FIG. 5 is a plan view showing a shutter closed state of the camera shutter driving device. FIG. 6 is a view taken along the line VI-V of FIG.
It is I sectional drawing. In this embodiment, a screw hole 1h is formed in the driving side arm portion 1c of the shutter opening / closing lever 1 in the extending direction, and the screw portion 30a of the adjusting member 30 is formed in the screw hole 1h.
Is screwed on. By changing the screwing position of the screw portion 30a of the adjusting member 30, the balance with the shutter-side arm portion 1b connected to the two shutter blades 4 and 5 can be easily adjusted.

[0024]

[Effect of the Invention] As described above, the invention according to claim 1 is:
An adjustment member is provided on the drive side arm of the shutter opening / closing lever to balance with the shutter side arm, so that the shutter opening / closing lever is balanced. However, the opening characteristics of the shutter blades have high accuracy, a stable shutter operation can be obtained, and malfunction of the shutter is reduced.

According to a second aspect of the present invention, the position of the adjusting member attached to the lever arm is changed to easily balance with the shutter-side arm connected to the two shutter blades. It can be adjusted and can be adjusted according to the camera.

According to a third aspect of the present invention, by using two shutter blades, the opening process of the shutter blades is divided into a plurality of regions, and the detection of the plurality of regions is performed by the two shutter blades. Detection can be performed separately by the detection unit, and a plurality of signals required for controlling the camera can be output without increasing the shape of the shutter blades or increasing the number of photo interrupters.

[Brief description of the drawings]

FIG. 1 is a plan view showing a shutter closed state of a shutter driving device of a camera.

FIG. 2 is a diagram illustrating a shutter open state of a shutter driving device of the camera.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a shutter control time chart of the shutter driving device of the camera.

FIG. 5 is a plan view showing a shutter closed state of the shutter drive device of the camera.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shutter opening / closing lever 1b Shutter side arm part 1c Drive side arm part 2 Lever rotation axis 4,5 Shutter blade 6,7 Shutter blade rotation axis K Drive means 21 Adjustment member

Claims (3)

(57) [Scope of request for utility model registration] A shutter opening / closing lever is provided so as to be rotatable about a lever rotation axis, and one shutter side arm of the shutter opening / closing lever is provided so as to be openable and closable about a shutter blade rotation axis. A shutter driving device for a camera which is connected to the respective bases of the shutter blades, the other driving side arm is connected to the driving means, and the driving means rotates the shutter opening / closing lever to open and close the two shutter blades. 2. The camera shutter driving device according to claim 1, wherein an adjusting member for balancing the driving arm of the shutter opening / closing lever with the arm of the shutter is provided. 2. The camera according to claim 1, wherein the adjustment member changes a mounting position on the driving side arm to adjust a balance with the shutter side arm. apparatus. 3. A detecting means for detecting an opening state due to an opening / closing operation of two shutter blades, and a detected portion for causing the detecting means to detect an opening state of the shutter blades is provided for each of the two shutter blades. Wherein the opening process of the shutter blades is divided into a plurality of regions, and the detection of the plurality of regions is independently detected by the detected portions of the two shutter blades, respectively. apparatus.