JPS591210Y2 - Shibori Komi Buttono Rotsukouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device for a narrowing down button, which is improved in order to completely eliminate erroneous operation of the narrowing down button, particularly when the manually operated narrowing down button is operated.

When focusing when shooting with an EE camera that has conventional wide-open metering, closing the aperture makes it easier to see the subject in the viewfinder, making it easier to focus, so this type of camera generally is equipped with a so-called aperture button that can be operated from the outside of the camera body, and when not in use, the metering is open, and if this button is pushed by hand in the direction of the axis of the guide ring, the aperture is narrowed down. It is supposed to return automatically when you release it, but
Some of them even peck after being sent away.

By the way, this type of aperture button did not have a locking device to maintain and hold the aperture metering state, so if the aperture button was pushed carelessly during shooting, it would cause an exposure error and make it difficult to obtain clear photos. This was often the reason for not being able to do so.

Therefore, in the present invention, a locking member is provided in the aperture button, which is guided by a guide ring and alternately switches from open metering to aperture metering, and the guide ring is provided with a member to be locked between the open metering position and the aperture metering position. A passage is provided for the member to be locked to select either one of the separate locking parts to be locked and the double-ended locking part, while a narrowing button is provided between the narrowing button and the guide ring in one direction. By attaching a coil spring-like force biasing member that is pushed or pulled by the lens and rotated in the direction of maintaining the locked state, it is possible to automatically lock the lens in either the normally open photometry position or the narrowed-down photometry position. This device eliminates all careless erroneous operations and completely eliminates the causes mentioned above.The present invention will be explained in detail below by way of an embodiment in which only the main parts thereof are illustrated. .

In the figure, 1 is a narrowing down button, which is a fingertip rest 1a,
It consists of a locking pin 1C planted on the side surface of the base shaft part 1b, a shaft rod 1d from the rear end surface of the base shaft part 1b, a retaining ring 1e fixed to the shaft rod 1d, etc. A sliding hole 2d is bored in the shaft rod 1d, and it is a guide ring for slidably holding and guiding the base portion 1b of the narrowing button 1, and has a guide ring for holding and locking the locking pin 1C. , a notch 2a for holding the open photometry position and a notch 2b for holding the narrowed photometry position, which are parallel to each other in a plane direction perpendicular to the axis after a required time, and the pin 1 for locking.
A notch 2C is provided for moving C from one of the notches to the other, and 3 has one end fixed to the rear end surface of the base portion 1b of the narrowing button 1, and the guide ring 2
It is a coil spring whose other end is fixed to the rear end surface, and this is a coil spring that pushes the aperture button 1 to the normally open photometry position and also engages and locks the pin 1C for the locked pin in each of the notches 2 a and 2 b. The rotating force is energized.

In the figure, 4 indicates a photometry device section, which consists of an open photometry circuit section A, a closed-down photometry circuit section B, a switching movable piece 4C1, its fixed contacts 4a, 4b, etc.
is a narrowing lever pivotally supported in the middle so that it can freely vibrate;
It has a contact part 5b with a protruding shaft 6a etc. at one end, and 6 is a drawing plate, which is supported by a pivot shaft 6b so as to be able to swing freely, but the protrusion is brought into contact with the abutting part 5b by a spring 6d. The shaft 6a and the like are brought into contact with each other, and 6b is an engaging portion with the narrowing pin 7.

Since it is well known that the aperture plate 6 can also be operated by operating the release button, illustration and explanation thereof will be omitted.

FIGS. 1 and 2 show the aperture button 1 of the present invention configured as described above locked in the open metering position.
When you want to perform aperture metering, first grasp the fingertip rest 1a of the aperture button 1, and push the locked pin 1C in the direction of the notch 2C in the guide ring 2 against the biasing force of the coil spring 3. In the figure, it rotates clockwise, and if it is pushed along the notch 2C and then rotates counterclockwise at the end and releases the hand, the locking pin 1C is used to hold the aperture photometry position in the guide ring 2. is inserted into the notch 2b, and receives a force from the coil spring 3 to rotate it in the direction opposite to the direction in which the notch 2C exists, and a force to push it back toward the open photometry position. It is firmly engaged and locked to maintain and retain.

At this time, the switching movable piece 4 in the photometric device section 4
C comes into contact with the fixed contact 4b on the side of the stop-down photometry circuit section B, and brings the stop-down photometry circuit section B into operation. Push the lever 5 to vibrate, and the protruding shaft 6a
The contact portion 5b of the other end of the lever 5 is brought into contact with the
The aperture is narrowed down by swinging the aperture plate 6 against the force of the spring 6d to operate the aperture pin 7.

Moreover, when returning from the above state to the open photometry position side, by performing the operation opposite to the above operation, the locked pin 1C
is inserted into the notch 2a on the open photometry position side, and is similarly engaged and locked in the notch 2a by the force of the spring 3, and is firmly locked so as to maintain and hold this state.

Of course, at this time, the stop ring 1e of the narrowing down button 1 also cooperates.
If the notch 2a is formed in the same manner as the notch 2b, the retaining ring 1e
becomes unnecessary.

At this time, the aperture of the photometry device section 4 is opened at the same time as the open photometry circuit section A is activated.

In this embodiment, a coil spring was used as the biasing member to push or pull the narrowing button in one direction and at the same time rotate it in the direction to maintain the locked state. Therefore, this is collectively referred to as a coil spring-like biasing member.

As is clear from the above description, according to the focusing button locking device of the present invention, the focusing button that is guided by the guide ring and is moved from the open photometry position to the focused photometry position and vice versa. The force biasing member installed between this button and the guide ring constantly applies a pushing force in one direction and a rotational force in the direction of maintaining the locked state. If the locked member is inserted into the notch for holding the open photometry position or the notch for holding the narrowed photometry position made on the guide ring, the pushing force and rotational force exerted as described above will be reduced. acts as a force that exerts a synergistic effect on the locked member as a force to maintain and hold the locked state within both the notches, so that the locked state at both photometric positions is perfect. This eliminates all unexpected events that would cause malfunctions, and significantly increases the practicality of this type of product.

[Brief explanation of the drawing]

The drawings show an embodiment of the locking device for the narrowing button according to the present invention. Figure 1 is a perspective view of only the main part and related parts, and Figure 2 is an enlarged side view of a part thereof. It is a diagram. 1...Narrowing down button, 1a...Fingertip rest, 1b...Base part, 1C...Lock pin, 1d... Axial rod, 1e... Stop ring, 2... Guide ring, 2a... Notch for holding open photometry position, 2b... Notch for holding stop-down photometry position. , 2C... Notch for moving the locked pin 1C, 3... Coil spring, 4
...Photometering device section, A... Circuit section for open photometry, B... Circuit section for embedded photometry, 4 a
, 4 b... Fixed contact, 4 C... Movable piece for switching, 5... Lever for narrowing down, 6...
・・・Aperture board, 7...Embroidered pin.

Claims (1)

[Scope of utility model registration request] A locking member is provided on the aperture button, which is guided by a guide ring and alternately switches from open metering to aperture metering, and the guide ring has separate locking members for locking the locking member in the open metering position and the aperture metering position. A passage is provided to allow the member to be locked to select either the locking part or the double-ended locking part, while the narrowing button is pushed or pulled in one direction between the narrowing button and the guide ring. A locking device for a narrowing button, characterized in that the button is equipped with a coil spring-like biasing member that rotates in a direction to maintain the locked state.