JPS5984223A - Automatic focusing camera - Google Patents

Abstract

PURPOSE:To load a release member constantly regardless of whether a photographic lens is in focus for short or long distance, by allowing a focus adjusting member which drives the photographic lens to be driven associatively with the stroke of the release member. CONSTITUTION:The release member 1 has long-sized holes 2a and 2b at its upper and lower parts and is attached in a vertically movable state to pins 3a and 3b provided in a camera body. This release member 1 is pressed up elastically by a spring 4 all the time. The focus adjusting member 5 which drives the photographic lens to a short-distance or long-distance position is energized counterclockwise by a spring 6 all the time. The focus adjusting member 5, however, is locked normally by locking a projection 5a provided at its outer circumference by a projection 1a of the release member 1. A stopper 7 for controlling the angle of driven rotation of the focus adjusting member 5 is locked by a projection provided to the focus adjusting member 5.

Description

[Detailed Description of the Invention] This invention allows focusing to be performed by moving the photographic lens from focusing on a short distance to focusing on a long distance, or vice versa, in conjunction with the release operation. This is about an autofocus camera.

Various automatic focus cameras of this type have been proposed in the past, but the shutter release position varies depending on the focus distance, and the shutter is released once the photographic lens is extended.

It may not be possible to achieve prefocus, or the load on the release member may change depending on whether the shooting lens is focused at close or long distance.

Since a plunger is used to lock the focus, a large electromagnet is required, which increases power consumption.
This included two problems, including an increase in installation space.

The present invention is intended to solve the above-mentioned problems, and in particular, a focus adjustment member for driving a photographing lens is made to follow the stroke of a release member.

This enables prefocusing to be performed as many times as necessary until the shutter is released with the final stroke of the release member, and the shooting lens is close-range.

It is an object of the present invention to provide an autofocus camera in which the load on a release member is constant no matter where the focus is at a long distance.

Next, the present invention will be described based on embodiments shown in the accompanying drawings.

Fig. 1 shows a first example, and 1 in Fig. 2 is a release member, and the release member 1 has elongated holes 2a and 2 in its upper and lower parts.
b, and is attached to pins 3a and 3b provided in the camera body (not shown) so as to be vertically movable. This release member 1 is always pressed upward by a spring 4.

Reference numeral 5 denotes a focus adjustment member capable of driving a photographic lens (not shown) to a near-distance position or a far-distance position, and the focus adjustment member 5 is always biased by a spring 6 in a left-handed direction. Therefore, during normal times, the focus adjustment member has a protrusion 5 provided on its outer periphery.
A is locked by engaging the projection 1a of the release member 1. Therefore, when the release member 1 is pushed down against the spring 4, the focus adjustment member 5 follows the release member 1 and rotates to the left. Reference numeral 7 denotes a stopper for regulating the driven rotation angle of the focus adjustment member 5, with which a projection 5b provided at another position of the focus adjustment member 5 is engaged. IO is an electromagnet, and the electromagnet 10 detects the signal level (short distance measurement signal or long distance measurement signal) of a distance measurement device 12 (see FIG. 4) having a switch 11 that is closed by the stroke when the release member 1 is pressed down. It is configured to be turned on or off depending on the distance measurement signal). 1
Reference numeral 3 denotes an iron piece lever that rotates around a pin 14, one end of which is in contact with the electromagnet 10, and the other end of which is in contact with the top surface 15a of the inclined cam 15 provided on the outer periphery of the focus adjustment member 5.
It abuts through the small protrusion 13a. This iron piece lever 13 is biased by a spring 16 in the direction of clockwise rotation.

When the electromagnet 10 is in the ON state, this iron piece lever 13 is attracted to the electromagnet 10 and does not rotate, and the focus adjustment member 5
While the electromagnet 10 is held in a position where it does not act on the locking protrusion 17, it is not attracted to it when the electromagnet 10 is in the OFF state, so the focusing member 5 rotates following the stroke of the release member 1. When the IJi diagonal cam 15 starts rotating along the slope 15b, the locking protrusion 1 of the focus adjustment member 5
It is designed to be locked at 7. In addition, 18 is Sha 7
In the terceso lever, the shutter set lever 18 is biased leftward by a spring 19, and a protrusion 22 provided on the upper edge of the locking lever 21 rotates around a pin 20. It is locked to 21a. This locking lever 21 is biased in the clockwise direction by a spring 23, and the other end 21b is positioned so that the lower end of the release member 1 can come into contact with it. Therefore.

When the locking lever 21 rotates counterclockwise during the final stroke of the release member 1, it is disengaged from the protrusion 22, and the shutter set lever 18 slides forcefully to the left by the spring 19, thereby operating a shutter (not shown). It looks like this.

This shutter set lever 18 is charged in conjunction with the winding of the film. 24 is a click spring, and 25 is a recess into which the click spring 24 engages, and is provided at an appropriate position on the left edge of the release member 1.

FIG. 2 shows a second example, in which a buffer spring 26 is provided on the protrusion 5b of the focus adjustment member 5, and the focus adjustment member 5 is rotated to the right by the spring 6.

In addition to absorbing the overstroke when bringing the iron piece lever 13 into contact with the electromagnet 1o, the electromagnet 1o remains in place even after the focusing member 5 begins to rotate following the operation of the release member 1. O depending on the signal level
Time until N or OFF state, iron piece lever 1
3 can be kept in contact with the electromagnet 10. This allows the focusing member 5 to operate in the same manner as the first example without providing an inclined cam.

FIG. 3 shows a third example. In this case, the focus adjustment member 5 is locked with the hook lever 27 so that the focus adjustment member 5 is not immediately driven by the first stroke of the release member 1. At the second stroke of the release member 1, the hook lever 27 is rotated counterclockwise to release it, and the focus adjustment member is rotated as a result. This is characterized in that focus can be achieved by reducing the movement of the focusing member 5.

6- Next, the operation of the present invention will be explained based on the first example. First, when the camera is pointed at the subject and the release member 1 is pressed down, the switch 11 is turned on with that stroke, and the measurement shown in the fourth figure is performed. Depending on the signal level of the distance device 12, the electromagnet IO is turned on or off. When the electromagnet 10 is ON, the iron lever 13 remains attracted to it, so the focusing member 5 follows the stroke of the release member 1 and rotates until its protrusion 5b abuts against the stopper 7. On the other hand, the electromagnet 10 is OF
When F, the iron piece lever 13 does not stick to it, so when the focus adjustment member 5 begins to rotate following the stroke of the release member 10, it rotates along the inclined cam 15 and locks the focus adjustment member 5. The focus adjustment member 5 engages with the protrusion 17.
Fix it when it rotates slightly. Focusing can be performed by adjusting the rotation angle of the focus adjustment member 5.

The fact that the focus is completed by operating the release member 1 means that the click spring 24 is inserted into the recessed part 25 of the release member 1.
By keeping the button engaged, the photographer can be notified. If you release your finger from the release member 1 in this state, the release member 1 will return to its original position (starting point) by the force of the spring 4. , it is possible to prefocus as many times as you like.

After focusing is completed, when the release member 1 is pushed further, the shutter is released and the photographing is completed.

As described above, the autofocus camera according to the present invention includes an electromagnet that is turned ON or OFF depending on the signal level of the distance measuring device linked to the stroke of the release member, and an electromagnet that is
When N, it rotates by a certain angle following the stroke of the release member.

When the electromagnet is OFF, the focus adjustment member does not follow the stroke of the release member or rotates slightly and is fixed, so the focus of the photographic lens can be adjusted to either close or long distances. The load on the release member does not change depending on whether the release member is turned on or off, and is always constant.

Moreover, since the shutter is released after focusing is completed, prefocusing can be performed as many times as desired before the shank is released. Furthermore, according to this invention, it is possible to lock and release the focus simply by operating the release button, and there is no need to charge the lens or charge the iron piece of the electromagnet, reducing the winding load, and the electromagnet itself can attract the iron piece lever. It is a small device that is sufficiently effective just by doing so, so it has various excellent effects such as being able to reduce its installation space and power consumption.

[Brief explanation of drawings]

The figures show embodiments of the invention, with FIG. 1 being a front view of the first example, and FIG. 2 being a front view of the second example. FIG. 3 is a front view showing the third example, and FIG. 4 is a block diagram. 1-.-release member, 5-focus adjustment member. 10-Electromagnet, 12-・Distance measuring device. 13.- Iron piece lever. 9- Figure 1 Figure 2 Figure 3 Figure 4 Procedure correction writing type) % formula % 1- Indication of the incident 1988 Patent Application No. 194616 2- Name of the invention Automatic focus camera 3- Make correction Relationship with the case Patent applicant address 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name
Konishi Roku Photo Industry Co., Ltd. Representative Nobuhiko Moto 4-Agent ■151 Address 2-5-1 Yoyogi, Shibuya-ku, Tokyo February 22, 1981 (shipment date) 6- Subject of amendment Application and specification 7 Fan Qi.

Claims (1)

[Claims] The electromagnet turns ON and OFF depending on the signal level of the ranging device that is linked to the stroke of the release member.When the 2M electromagnet is ON, it rotates by a certain angle following the stroke of the release member. . An automatic focus camera comprising a focus adjustment member that does not follow the stroke of a release member or rotates slightly and is fixed when the electromagnet is OFF.