JPS6326810Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a camera that prevents the shutter release from being inadvertently released due to an impact to the camera.

In conventional cameras, when the camera is inadvertently dropped, the impact may cause the shutter release to be released, resulting in unnecessary shooting.

A well-known camera is shown and described in detail in FIG.

The shutter release is performed by pressing the release lever 2, which releases the shutter of the lens barrel 1, to the lower right from the state shown in the figure.As is well known, the shutter blade (not shown) is released, and the shutter is released after a predetermined period of time. The blades are closed.

When photographing, the shutter button (not shown) is pressed, the set lever 3 is raised, the bell crank 4 is rotated clockwise, and the end 4a of the bell crank 4 moves the release lever 5 downward against the spring 6. slide it.

The spring 6 normally has a weak bias that absorbs vibrations and returns to the initial position.

By sliding the release lever 5 downward, the end 5
At step a, the shutter release is released by pushing down the release lever 2 to the lower right, and the shutter blade (not shown) is opened to take a picture.

Next, if the camera is inadvertently dropped downward as shown in Figure 1, the impact of the fall will cause an inertial force in the downward direction in the figure that is proportional to its own weight to act on the release lever 5. This force is caused by the force of the spring 6. Although the direction is opposite to the bias, if the inertial force is large, the release lever 5 will be slid downward. As a result, the release lever 2 is pressed and the shutter release is released.
The shock of dropping the camera causes the shutter to open, resulting in unnecessary shooting.

In this way, the camera can be protected against shocks caused by dropping the camera, etc.
In the present invention, the release lever 5 is locked and held at a predetermined position to prevent release of the shutter release in the event of an impact.

The present invention will be explained below with reference to FIGS. 2 and 3.

Although not shown in the figure, the lens barrel 1 has a built-in well-known lens shutter mechanism, and this lens shutter mechanism opens by moving the release lever 2 toward the lower right in the figure. , a well-known mechanism in which the shutter is closed after a predetermined period of time.

In the shutter release operation, by pressing the shutter release button 9, the set lever 3, which is biased upward in the drawing by the spring 10, is released from the charge position and moved upward from the state shown in the drawing.
Rotate the bell crank 4 clockwise. The rotation of the bell crank 4 presses the release lever 2 of the lens barrel to release the shutter release.

Next, by performing the film winding operation, the set lever 3, which has been moved upward in the figure via a mechanism not shown, is moved downward in the figure while accumulating the force of the spring 10, and at the same time, the shutter charge lever on the lens side is moved upward in the figure. Pull down 8 to perform a shutter charge.

After performing the shutter charge, the set lever 3 is held at the predetermined position shown in FIGS. 2 and 3, waiting for the next press of the shutter button.

Although the above-described shutter release operation and shutter charge operation are already well-known operations, the configuration for locking the release lever at the time of impact, which is a feature of the present invention, will be explained.

As described in the prior art section, when the impact from a fall of the camera is applied to the release lever 5 in the release release direction, the release lever 5 slides and presses the lens-side release lever 2, releasing the shutter release. It is something that can be done.

Therefore, in the present invention, in order to prevent the release lever 5 from sliding due to impact, a locking portion 4c is provided as a locking member on the bell crank 4, and this locking portion 4c is provided as a locking member.
c is arranged so as to face within the sliding stroke of the release lever 5, and the protrusion 5 of the release lever 5
b and the locking portion 4c of the bell crank 4 engage when a downward impact is applied in the figure, and the locking portion 4c prohibits the release lever 5 from sliding downward, making it impossible to release the shutter release. prevent something from happening. The bell crank 4 is supported by a shaft 11, and a weight 4d is provided on the left side 4b of the bell crank, which is the opposite side of the locking part 4c.When the camera is subjected to an impact as described above, the weight 4d will prevent the bell from being damaged. A habitual force is applied to rotate the crank 4 in the counterclockwise direction, so that the locking portion 4c is reliably engaged with the protrusion 5d of the release lever 5 at the time of impact. This further prevents the release lever from sliding during impact.

It is also possible to provide a spring that biases the bell crank 4 in the counterclockwise direction in the figure instead of the weight 4d of the bell crank 4, but in the case of a weight, the above-mentioned locking force can be adjusted depending on the strength of the impact applied to the camera. Since the force pressing the portion 4c against the protrusion 5b increases proportionally, reliable engagement can be achieved.

When a spring is used instead, the force that presses the locking part 4c against the protrusion 5b is a constant force, and when a particularly strong impact is applied, the bell crank etc. vibrates.
It is possible that the engagement becomes unstable. In the case of weights, the vibrations of the bell crank are canceled out on the left and right sides, making it possible to absorb shock.

During photographing, when the release button is pressed, the protrusion 3a of the set lever 3 is moved upward (in the direction A in the figure) by the force of the spring 10, and the left end 4b of the bell crank 4 is pushed and rotated clockwise. Due to this rotation, the locking part 4c is retracted out of the sliding stroke of the release lever 5, and the end 4b of the bell crank 4 pushes down the release lever 5, and the locking part 4c and the protrusion 5b do not engage with each other and remain as they are. , the release lever 5 is slid downward, the end 5a presses the release lever 2 on the lens side, and the shutter release is released.
The shutter is activated.

It may be possible to respond to shocks to the camera by increasing the force of the spring 6 that urges the release lever 5 upward in the figure, but this would mean that a spring with a stronger force would be required during the release operation.
For example, the spring 10 needs to be strong and durable.
Due to precision and other factors, it is not possible to make it too strong, and there are limitations.

As described above, in the present invention, the release lever is securely held in place and the locking part is properly arranged.
This makes it possible to provide a camera that does not release the release due to shocks from outside the camera.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional camera, and FIGS. 2 and 3 are explanatory views of main parts of a camera equipped with the shock safety mechanism of the present invention. 1... Lens barrel, 2, 5... Release lever, 3... Set lever, 4... Bell crank,
4c...locking part, 4d...weight.

Claims (1)

[Scope of utility model registration request] A bell crank member that rotates when the shutter release button is pressed, and a bell crank member that comes into contact with the release lever during the shutter release release operation in a camera that pushes down the release lever and releases the shutter release by the rotation of the bell crank member. and a weight provided on the opposite side of the end with respect to the center of rotation of the bell crank member, which engages with the release lever to prevent the release lever from sliding except when the shutter release button is pressed. When the camera is dropped, the inertia of this weight rotates the bell crank member in the opposite direction to when releasing the shutter release, and the locking part of the bell crank member and the release lever are provided. A camera equipped with a shock safety mechanism that strengthens the engagement with the release lever and prohibits sliding of the release lever.