JPS6218901B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the case of using a self-timer in a type of camera in which the focusing of the photographic lens is automatically performed.

2. Description of the Related Art Cameras that detect the distance between a subject and a camera and electrically generate a signal to focus a photographic lens are gradually becoming popular and are extremely convenient for users. On the other hand, various inconveniences occur when photographing oneself using a self-timer. In other words, even if the subject stands directly in front of the camera and starts the self-timer, or stands behind the camera and starts the self-timer, a camera that focuses when the self-timer starts may cause incorrect focusing. The distance will be set.

Furthermore, even with cameras that focus after the self-timer is activated, it is difficult to imagine that the subject is located within the camera's focusing field of view (which is generally an extremely narrow angle) after the self-timer starts. However, it is easy for the distance to be set at an inappropriate distance.

In view of the above, when using a self-timer, the present invention operates a distance limiting means that has priority over the automatic focus adjustment function to limit the photographing distance.

That is, in connection with the setting of the self-timer, a distance limiting means for limiting a part of the photographing area is activated,
This invalidates the inappropriate distance range of a part of the distance detected by the automatic focus adjustment device.

Hereinafter, with reference to the drawings showing embodiments of the present invention,
Explain in detail.

In the figure, a ring 1 carries a photographic lens and is rotatably supported around an optical axis, and is supported by a spring 1a.
This gives it levorotatory properties. The camera also includes a cam portion 1c which is set appropriately between a cam A corresponding to the infinite distance of the operation protrusion 1b and the photographing lens and a cam E corresponding to 1.0 m.

A part of the setting plate 2 is shown in the figure, and in the illustrated charge position, the operating projection 1b is restrained against the spring 1a, and in the focus adjustment operation, it travels to the left.

The adjustment lever 3 is rotatably supported around a shaft 3a, has a curved portion 3b and locking teeth 3c, and is normally stopped at a right-handed rotation position in the figure.

The iron piece lever 4 is rotatably supported around a shaft 4a, includes a claw portion 4b that engages with a locking tooth 3c, and a magnetic portion 4c, and is given dextrorotation by a spring 4d. In the charge position, the crimp member 5
The magnetic part 4c is connected to the electromagnet 6 against the spring 4d.
It is crimped.

The electromagnet 6 is excited when power is supplied to the coil 6a, and is controlled by a known automatic focus detection electronic circuit 7.

The self-timer 8 is set by rotating the setting member 8a around the shaft 8b in the direction of the arrow, and delays the shutter start for a certain period of time after the camera release operation.

The distance limiting means 9 is rotatably supported around a shaft 9a, includes a curved portion 9b that engages with the cam D of the cam portion 1c, and is given levorotation by a spring 9c.
It comes into contact with the fixing pin 9d and stops. In the illustrated state, the curved portion 9b is retracted from the operating range of the cam portion 1c, and rotates to the right around the shaft 9a against the spring 9c in conjunction with the setting of the setting member 8a in the direction of the arrow. Then, the curved portion 9b projects into the operating range of the cam D.

Next, to explain how it works, when the camera release operation is performed in the state shown, the electronic circuit 7
is activated to supply power to the coil 6a, and the electromagnet 6 attracts the magnetic portion 4c.

Subsequently, the crimp member 5 is retracted to the left, and the iron piece lever 4 is controlled by the electromagnet 6 under the action of the spring 4d. At the same time, the adjustment lever 3 is turned to the left around the shaft 3a, and when a focused focal length detection signal is obtained by interlocking with the electronic circuit 7, the power supply to the coil 6a is cut off, the electromagnet 6 is demagnetized, and the iron piece The lever 4 is rotated to the right around the shaft 4a by a spring 4d, and the claw portion 4b locks a part of the locking tooth 3c, thereby stopping the adjustment lever 3.

When the set plate 2 is released by the subsequent release operation, the set plate 2 moves to the left and touches the protrusion 1b.
follows, and the ring 1 also turns to the left around the optical axis by the spring 1a, and one of the cams of the cam portion 1c moves to the curved portion 3.
b, then stops and sets the photographic lens to the in-focus position.

At the end of the leftward travel of the set plate 2, a shutter (not shown) is activated and the photographing is completed.

To charge the camera again, charge the shutter (not shown) in conjunction with film winding, move the set plate 2 to the right, operate the protrusion 1b, and rotate the ring 1 to the right against the spring 1a. Turn the iron piece lever 4 by pressing the crimping member 5 at the same time.
Turn left around axis 4a against spring 4d,
The magnetic part 4c is crimped onto the electromagnet 6, and charging is completed in the illustrated state.

Next, in order to use the self-timer 8, when the setting member 8a is set in the direction of the arrow, the distance limiting means 9
is rotated to the right around the shaft 9a against the spring 9c, and the curved portion 9b projects into the operating range of the cam D.

When the camera release operation is performed in this state, the adjustment lever 3 is activated, the electronic circuit 7 controls the electromagnet 6, and the adjustment lever 3 is stopped at the in-focus position. If you stand directly in front of the camera and perform the release operation, the camera will stop at an inappropriately close distance. Even in cases like this,
The curved portion 9b of the distance limiting means 9 acts, and the set plate 2
Even if the ring 1 turns to the left as the vehicle travels, the ring 1 is restricted without setting the photographic lens at a very close distance.

In a known manner, the setting plate 2 is delayed by a self-timer 8, and after a predetermined period of time has elapsed, it moves further to the left, and the shutter is activated to complete the photographing.

Note that the cam portion 1c of the ring 1 in the above description
In order to change the shooting lens, cam A was changed to 1.0m.
In addition, if the cam E is made to correspond to infinite distance, and the intermediate distance is set appropriately, the distance limiting means 9 can be set as follows.
This will restrict Ring 1 from being set to infinite distance, and when using the self-timer,
To prevent distance detection from becoming infinite distance and adjusting a photographic lens to infinite distance because the person who is the subject stands behind the camera and performs a release operation.

Furthermore, if the curved portion 9b is provided in correspondence with the normal focal position of the photographing lens, it is possible to photograph most scenes in focus.

Furthermore, if the bending portion 9b is not provided in correspondence with the cam portion 1c, but the distance limiting means 9 is switched to directly apply a limiting effect to the electronic circuit 7,
The adjustment lever 3 replaces the action of the above-mentioned curved portion 9b,
Creates a distance-limiting effect.

In addition, whether the curved portion 9b is limited to being set to either extremely close distance or infinite distance, or
The camera or
It should be designed according to the intended use.

As described above, according to the present invention, when taking a picture using the self-timer, the distance limiting means is activated in conjunction with the setting of the self-timer to limit the operating area of the photographic lens. This makes it possible to perform photographing without causing any inconvenience and with fewer malfunctions.

Note that the distance limiting means may be configured as a single means that limits setting to both extremely short distance and infinite distance.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention, and shows a state in which the self-timer is not set. DESCRIPTION OF SYMBOLS 1...Ring, 2...Set plate, 3...Adjustment lever, 5...Crimping member, 7...Electronic circuit for focus detection, 8...Self-timer, 8a...Setting member,
9... Distance limiting means.

Claims (1)

[Scope of Claims] 1. A camera that detects the distance between a subject and the camera and automatically determines a focal position of a photographic lens, comprising: a photographing lens actuating member that moves the photographing lens to a focused position; and said actuating member. a setting member for manually setting the self-timer, and a distance for disabling automatic distance setting in at least a part of the shooting distance. and a limiting means, and in connection with the self-timer setting operation of the setting member, the limiting means limits the operation of the operating member, thereby limiting the operating range of the photographic lens. Self-timer for camera. 2. Claim 1, wherein the distance limiting means locks and limits the operating member at a position corresponding to a regular focal position of the photographic lens.
Self-timer as described in section. 3. The self-timer according to claim 1, wherein the distance limiting means limits setting of the actuating member to a distance greater than a certain distance from the photographic lens. 4. The self-timer according to claim 1, wherein the distance limiting means limits setting of the operating member to a short distance below a certain distance from the photographic lens.