JPS5817937B2 - Device for arbitrarily switching and instructing automatic or manually selectable aperture adjustment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of selectively performing automatic and manual adjustment of the aperture, and includes a pointer that automatically indicates the aperture value;
A camera having an aperture value scale plate having an index for automatic operation and a mark for indicating the aperture value during manual operation, in which the aperture value scale plate and the mark are movable relative to each other.
The present invention relates to an automatic or manual operation type and a lens barrel that indicates the aperture value adjusted in each operation type.

In known devices of this type, a scale plate is arranged in the viewfinder of the camera, and a pointer moving over the scale indicates the expected aperture value in automatic operation as well as the aperture value previously selected in manual operation.

For this purpose, a rotatable scale plate is provided in the camera, which has the aperture value and the code IAutoj for automatic operation and is fixedly connected to the rotatable casing within a certain range of the exposure meter. There is.

The scale plate can be rotated in a certain angular range, in which case the symbol "AutoJ" or one of the aperture values is adjusted to a fixed mark.

When the symbol "Autol" is adjusted to the mark, an exposure meter is connected and the measured exposure value is indicated from the exposure meter via a pointer on the aperture value scale plate disposed in the viewfinder.

When the scale plate is rotated from the A-autoJ position, the exposure meter is shut off and the pointer is fixed so as not to move by a protrusion fixed to the casing of the exposure meter.

By rotating the scale plate so that one of the aperture values is aligned with the mark, the exposure meter casing also rotates, and the pointer in contact with the protrusion is moved so that the tip of the pointer aligns the corresponding aperture value with the scale in the fine section of the camera. It is rotated to the position shown in .

Even if we ignore the complex structure of this device, which requires a rotatable exposure meter casing and two aperture scale plates,
Furthermore, since the exposure meter pointer indicates the aperture value whether it is automatically or manually operated, this device clearly distinguishes whether the photographer adjusted the pointer automatically or manually. It has the disadvantage that it cannot be obtained.

In this case, the photographer needs to confirm by checking the scale plate whether the aperture value is adjusted to 1 aperture, that is, manual operation, or to AutoJ, that is, automatic operation.

The invention therefore makes it possible in a device of the type mentioned at the outset to clearly recognize automatic or manual operation for the aperture adjustment with minimal outlay and thus to make it possible to read out the aperture in the respective operating form. The fundamental problem is to eliminate the possibility of erroneously assigning values to other operation formats each time.

According to the invention, this problem is solved by arranging the aperture scale and the symbol on a fixed scale ring and the mark on a rotatable adjustment ring adjacent to the scale ring, and a pointer which can be pivoted along the aperture scale. The solution is to make the mark observable when adjusted to the automatic operating index and obscured in all other adjustable positions.

In this case, a device is proposed which has only one aperture value scale on which two mutually independent hands are adjusted and which are opposite each other.

In other words, in automatic operation, the pointer that indicates the aperture value in manual operation is configured as a mark on a rotatable ring.
Adjust to index A for automatic operation.

Therefore, only the pointer, which is located outside the aperture value scale and can be pivoted automatically over the aperture value scale, makes it possible to read the aperture value.

In manual operation, the latter pointer is hidden from view, and only the mark on the adjustment ring is adjusted so that the desired aperture can be read.

Next, the present invention will be explained in detail based on the drawings.

A scale ring 2 is fixedly arranged on the lens barrel of the objective lens indicated by 1 in FIGS. 1a and 2a.

The scale ring has a scale plate 3 having an aperture value and an index A for automatic aperture operation.

In this case, automatic operation means automatically defining and adjusting the aperture required to properly expose the photographic image, independent of the user, whereas manual aperture preselection means that the desired aperture is is adjusted manually before taking the picture, and the actual adjustment of the aperture aperture is done automatically after the shutter is released.

The scale ring has a notch 4 over the entire range of aperture values, and when the indicator is adjusted to A (Fig. 1), the tip of the pointer 5 connected to the aperture adjustment mechanism can be observed within this notch. It is possible.

The cutout can be covered with a transparent plate, thus preventing contact with the pointer.

As can be seen in FIG. 1b, the pointer is tightly fastened to a drive ring 6 for adjusting the aperture blades.

Parallel to the scale ring 2, an adjusting ring 7 with markings 8 is rotatably arranged.

The mark 8 can be opposed to the automatic index A or to each of the aperture values by rotating the adjusting ring.

A pin 9 is fixed to the adjusting ring coaxially with respect to the axis of rotation, and is rotatable within the pivoting range of the pointer 5.

Furthermore, the adjusting ring has an axial projection 10 which cooperates with a bushing rod 11 which is displaceably disposed coaxially on the scale ring 2.

A ring-shaped auxiliary plate 12 is arranged on the bushing rod 11, which completely covers the notch 4 of the scale ring when the mark 8 is at any position of the aperture value.
Therefore, the pointer 5 cannot be observed.

When the mark 8 faces the automatic operating indicator A, this auxiliary plate presses down on the spring 13 and is removed from the area of the recess 4 of the scale ring, so that the pointer 5 can be observed.

A switch 14 for turning on and off the automatic throttle system is arranged within the pivoting range of the pin 9.

For example, automatic aperture adjustment is described in West German patent application box 220991.
This is carried out via an electromagnetic sector drive controlled by an exposure meter as described in No. 3.4.

The electromagnetic sector drive is located in the balanced branch line of the Wheatstone bridge and turns off as soon as the correct aperture is adjusted.

Switch 14, when connected, causes the sector drive to detun the bridge so as to adjust the minimum aperture.

Next, the operation of the device of the present invention will be described in detail: When the adjusting ring 7 is rotated so that the mark 8 is aligned with the index A (automatic operation), the pin 9 is simultaneously rotated so as to open the switch 14.

Upon rotation of the adjusting ring 7, the bushing rod 11 rests on the projection 10 of the adjusting ring and moves axially against the spring 13.

The auxiliary plate 12 is then removed from the cutout 4 of the scale ring 2, so that the pointer 5 connected to the drive ring 6 of the aperture blade 1 can be observed.

The automatic exposure measurement device and automatic aperture adjustment device are fully operational.

Adjustment of the diaphragm takes place automatically in accordance with the prevailing lighting conditions, the adjusted diaphragm being readable on the diaphragm scale 3 by means of a hand 5.

If the aperture is to be determined by oneself during photographing, the adjustment ring 7 should be adjusted from the automatic position to the desired aperture value, for example to an aperture value of 8 as shown in FIG.

Furthermore, the rotation of the adjustment ring 7 also causes the pin 9 to rotate, so that the switch 14 is connected.

West German Patent No. 2209913.
As described in No. 4, the wheelstone bridge is unbalanced in such a way that the automatic adjustment system of the aperture tries to adjust the aperture to a minimum value, for example aperture 22, upon release of the exposure process.

The automatic operating system is blocked in that the pointer 5, which moves together with the drive ring 6, hits a pin 9 at the position of a preselected diaphragm adjustment device, for example the diaphragm 8, and is fixed there.

When the mark 8 is pivoted away from the index A of the scale ring 2, the bushing rod 11 is disengaged from the projection 10 and the spring 13
The auxiliary plate 12 thus passes into the recess 4 of the scale ring and covers the pointer 5.

Therefore, it is only possible to make the mark 8 face the aperture value, and erroneous reading of the aperture value can be prevented.

Next, embodiments of the present invention and related matters will be listed: 1) The scale ring 2 has a notch 4 extending over the entire scale range of the aperture value scale plate 3, and the pointer 5 is located within the range of this notch. 2. The device according to claim 1, wherein the recess is arranged so that it can be covered by an auxiliary plate 12'i.

2) A device according to item 1, in which the auxiliary plate 12 is arranged on a bushing rod 11 which is axially movable by means of an adjusting ring.

3) The adjustment ring 7 has a protrusion 10, and when the adjustment ring is rotated to a position where the mark 8 is aligned with the automatic operation indicator A, the bushing rod 11 protrudes so that the auxiliary plate 12 opens the notch 4. 10. The device according to item 2 above.

[Brief explanation of the drawing]

1a is a partially sectional plan view of the device according to the invention when adjusted to automatic operation; FIG. 1b is a sectional view taken along the line 1b-1b of FIG. 1a; and FIG. FIG. 2b is a partial cross-sectional top view of the device according to the invention when adjusted to 8); 2b of FIG. 2a; 2. FIG. 3 is a sectional view taken along line b. 1...Objective lens, 2...Mountain ring, 3...Aperture scale plate, A-...Automatic operation index, 5... ... Pointer, 7 ... Adjustment ring, 8 ... Mark, 9 ... Pin, 1
4...Switch.

Claims (1)

[Claims] 1 Automatic and manual adjustment of the aperture can be carried out selectively, and the aperture value scale plate has a pointer that automatically indicates the aperture value, an index for automatic operation, and the scale plate and mark move relative to each other. An aperture having an index A for automatic operation in a lens barrel that indicates an automatic or manual operation type and an aperture value adjusted in each operation type for a camera that has a mark that indicates an aperture value when manual operation is possible. A value scale plate 3 is arranged on the fixed scale ring 2 and a mark 8 is arranged on a rotatable adjusting ring 7 adjacent to the ring 2, so that a pointer 5 which can be pivoted along the aperture value scale plate can be moved by the force of the mark 8. Automatic or manual operation, characterized in that it is provided with an auxiliary plate that is observable when the mark is adjusted to the operating mark, but which is occluded when the mark is in all other adjustable positions. A lens barrel that indicates the aperture value adjusted by the type and each operation type.