DE1522302C - Photographic lens with a device for common aperture and distance setting for flash photography - Google Patents

Description

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distance to assume values so large that an extraction or focusing movement from the distance wall free Conversion of the rotary movement of the desynchronizer from in a particularly expedient manner

Fernungsstellers in the longitudinal movement of the optics because of the summation of a screwing movement and a No additional risk of jamming and excessive friction due to a three-dimensional cam gear

more is possible. This limit of self-locking 5 causes movement generated, this additional

can be used for the large distance values with direct coupling of the Ent cam gear

distance controller by putting off a negative first and, after crossing over, a

the interval angle of the diaphragm is as large as possible, the reversal point with a slope of 0 for the near values

makes, but with linearized apertures this is a positive direction of movement compared to the

as is known, only possible to a very limited extent. io direction given by the screwing movement

Another crucial disadvantage of this well-known testifies.

The device is that as a result of the logarithmic parts

adjustment of the distance scale and the resulting

the progressive increase in the pitch angle of the movable lens part arranged gear part

Curve slit a depth of field with 15 a large deviation from linearity without the

usual means is not possible. So you have to face the difficulties mentioned above, because

manage without this familiar facility or the steep gradient of the curve transmission in the local

Use depth of field tables to help determine the natural area around the slope of the corresponding

borrowed is quite inconvenient and retrograde. Screwing movement is reduced. The second

The purpose of the invention is to avoid these disadvantages dung, whereby the handling of the exposure value aperture ring needs so even if one The setting for flash photography simplifies a large setting range for the guide number cup is that the end stops of the actuators development wants to reach, only little of the linearity is evident become noticeable. give way.

The object of the invention is to provide a device for 25 In this arrangement according to the invention, the Coupling between aperture and distance adjusters relative stroke movement between the screwed to find the largest possible setting range of the gear member and the one moving through the curve has and the transmission of the diaphragm adjusting movement is relatively small and it is in further Ausgeauf the distance adjuster and, conversely, in the embodiment of the invention, the freedom from play of the transmission ratios favorable to curves and without movement can be advantageously produced in this way, risk of jamming when reaching the possible that a spring force between these two links Extreme positions of distance and diaphragm plates are brought into effect.

allowed. The coupling of the two adjustment means should furthermore be advantageous according to the invention if

according to a guide number scale in differenti - the transfer of motion between distance

possible relative positions. 35 digits and guide number digits through a curved one

The invention solves the problem in such a way that pin-slot coupling takes place, the relative

between the distance adjuster and the purpose of moving the pen to the curved slot

the focus adjustment of the longitudinally adjustable lens determined by the screw movement mentioned above

version is a known non-linear gear.

is interposed and that between the Ent- 40 Finally, according to the invention, a

rangefinder and the aperture stop or the one with depth of field display on a facility

Another non-detachable guide number controller - which of the distance controllers is the screw link,

linear transmission gear is arranged. thereby made possible that the distance adjuster or

The advantages resulting from the invention a part firmly connected to it is designed in this way are in the adjustment of the angle of rotation of the distance 45 is that it or it is the fixed part of the tion adjuster to those of the diaphragm adjuster to the objective encompasses the form of a sleeve and the distance vision or, viewed kinematically the other way around, the scale takes place on the rear, the fixed part of the objekdie Conversion of the angle of rotation of the diaphragm or tiv facing end carries, and that under this Guide number controller in the respective associated sleeve-shaped part of curved guidelines attached-Fokussierverstellwege the optics are arranged by two preferred 50, which are denoted by f-numbers wisely executed as curve controls not and when unscrewing the distance adjuster linear adjustment gear. The division of the distraction towards the close-up focus is more and more visible distance scale is therefore not a conventional one; they will, with their intersections with the trailing edge but does not need to be logarithmic either. That of the distance regulator the limits of the may seem a bit complex, but is due to the 55 sharpness range for the respective aperture values in the indicate this division of the deviations from the linear relationship with the distance scale, did not do as great in both transmissions as in the case of the device according to the invention previously known facilities. It is possible with a good efficiency and extensive good efficiency of the device greater freedom of play in the transmission of motion from and Setting ranges in the guide number clutch than in all 60 thus enables a larger setting range for to realize previously known facilities. the common adjustment of distance and In addition, at least one of the transmission aperture than all previously known devices of this very simple means with a freely selectable type of linearity. Another advantage here is that through the deviation can be used. In addition, relatively small linearity deviations in the Bewesich, As the further explanations show, for this 65 transmission transmission between the distance regulator and Arrangement according to the invention, relatively simple aperture or guide number dials for the setting range find forms of leadership. for the distance with the preselected guide number

In a further embodiment of the invention, the stop of the diaphragm setting at the greatest or

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smallest aperture is clearly noticeable and there is also a snap ring for guiding the drive ring 13 and 15

It does not matter whether the joint adjustment is a locking ring. The frame part 2 is in

of aperture and distance on the removal or screw tube 4 and arranged to be longitudinally displaceable

on the aperture or guide number dial. Closing there are two 180 ° offset to each other in part 2

The simple and obvious type of 5 similar curved slots 2 α is milled in,

Depth of field display and the small space requirement of which only one is shown in part.

as an advantage to heat. In these slots 2 α engages one each in the auger tube 4

The details of the invention are described in the pin screw 4 b . To eliminate the

Exercise and drawing explained. It represents play between slot 2 α and pin screw 4 b

F i g. 1 is a partially sectioned view of a compression spring 16 between the scale ring 6 and

Lens with a device in which the end ring 15 is arranged.

Removal ring the screw member according to the invention in FIG. 2 is with 6 α again the distance scale and in which the non-linear transmission of the denotes and 5 c are curved guidelines, the angle of rotation of the same on a guide number ring through while 5 b again the index triangle with a combined pin-slot coupling; 15 is a lengthening index line.

Fig. 2 shows a view of the distance and In Fig. 3 with 6 a, la and 8a are the scales for

Depth of field scale marked with curved lines in distance, guide number and aperture and 8 b

Close focus; is again the index for the relative adjustment between

F i g. 3 is a schematic representation of the guide number and aperture rings seen. The dash-dot

Movement transmission and the summation of the curve 17 drawn in is the one that is used in

individual adjustment paths between aperture and distance logarithmic division of the distance scale and

adjustment ring. direct coupling of the distance ring with

In Fig. 1, a stationary camera is created with the guide number ring in a known manner

connecting part referred to. 2 is a for the purpose of dignity. The solid corrected curve 18 is in FIG

Focussing longitudinally displaceable, the lens 3 25 its gradient course through the curve transfer

load-bearing frame part. 4 is a in a feststehen- 7 already somewhat c balanced. With the straight line 19

The tube 5 mounted by means of a worm thread is the linear gradient of the worm tube

Screw tube. Firmly indicated with the screw tube. After all, with 2 a is the one to die

bound is a scale ring 6 with the distance screw tube adjustment path reduced curve

scale 6 a. On the fixed tube 5, a 30 run of the curve 18 is designated, the greatest slope of which

Depth of field scale 5 α as well as an index 5 b for the angles considerably lower than in curves 17 or

Distance scale arranged. With 7 there is one on the 18 is.

Tube 5 by means of fine thread mounted guide numbers - The mode of operation of the device is as follows: called ring. He wears a guide number scale 7 a. When the aperture ring 8 is pulled back, i.e. from the guide number, a web 7 b is firmly connected to it, 35 ring 7 disengaged aperture ring 8, in turn, by milling in the tube 5, back and aperture adjustment are made separately,
through between the screw tube 4 and the mount part 2 If you want to take flash photos, it protrudes. This web 7 b is provided with a curved one by turning the distance or slot 7 c , in which in turn a pin screw 4 α seated in the diaphragm ring - or on both - the index screw tube 4 at one point 1 on the diaphragm ring through the light grips, whereby the screw tube 4 and guide number density of the flash unit and the sensitivity of the ring 7 are coupled with one another. 8 is an aperture recording material certain guide number and locks ring with a linearized aperture scale 8 α and by moving the aperture ring 8 the pin 9 an index point 8 b as a setting mark for the front in the corresponding locking groove 7 d . The choice of division of the guide number. The aperture ring 8 is with two. 45 angle of the grooves can expediently also provide recesses 8 c, which together make up fractions of the aperture scale graduation, with locking balls and springs 10 arranged at least twice on the circumference of the tube 8 so that intermediate values of the guide number are adjustable.

and 11 allow the diaphragm ring to be axially divided into two.

to bring different locking positions. Connected in the diaphragm ring, you can now turn it

ring 8 is also seated a cylinder pin 9, which makes the focus on its focus ring

on the other hand through this axial displacement in engagement with and thus at the same time the associated aperture value

Set in the sense of the division of the aperture scale on the guide. By not specifically shown

number ring arranged locking grooves 7 d can be brought end stops of the aperture ring is by itself

and is also shown in the locked state. 55 based on the set guide number

With 12 a further web is referred to, which is fixed with possible distance adjustment range. the

the tube 5 is connected and as a straight line longitudinal displacement of the mount part 2 is when

for the socket part 2 is used. 8 d is finally a turning of the (distance) scale ring 6 through the

third web, which is attached to the diaphragm ring 8 and with summation of the screw movement of the screw

a straight slot 8 e is provided and over 60 tube 4 and the through the curved slots 2 α im

which the drive ring 13 of the iris diaphragm by means of frame part 2 determined relative movement of the

the pin screw 13 is coupled α. 14, a mount part 2 for the screw tube 4 is produced.

For this 1 blue drawings

Claims (5)

1 2 in different relative positions according to one of the claims: Guide number scale, detachable guide number set. Such devices are known in which 1. Photographic lens with a one-way direction of rotation of the distance ring through the direction of the curve to the common distance and 5 gears, which may be set with gear drives for diaphragm setting when taking flash pictures with a. are coupled or, by means of cam-controlled articulations, next to the diaphragm adjuster and, preferably, drives are each mounted centrally to the rotational paths of the diaphragm adjuster and adapted with the same. The disadvantage here is that such different relative positions according to a gearbox are very expensive, and because they can be coupled because of the guide number scale, io otherwise occurring reversal range and thus characterized that between bound inaccuracies in the transmission of the distance divider (6) and the for the purpose of adjustment paths, as a rule, are designed as non-positive curves of the focus setting, longitudinally displaceable lens gears, they can be at most in tive mount (2) a known non-linear one direction a stop limit for the gear (2 a; 4 b) is interposed and that 15 distance adjustment when reaching the largest or between the distance divider (6) and the smallest possible aperture value. This aperture plate (8) or the stroke limiter that can be coupled with it is also arranged because of the general guide number plate (7) a further non-linear my flat curve when actuating the transmission gear (4 a; 7 c). can only be felt as a very soft stop and it can 2. Device according to claim 1, characterized by 20 already with normal application of force indicates that the longitudinal displacement of the easy to deform in this Adaptungsge lens mount by adding up a drive, which can lead to the complete useless screwing movement and an additional one through the device. To these disadvantages too A three-dimensional cam mechanism for avoiding the large has also become known that be-distance values first a negative and 25 special stop stairs or similar for the Benach Passing over a reversal point with the limit of the setting range in the gearbox before slope 0 for the near values are seen as a positive movement. This increases the effort direction of movement compared to that by screwing is even more and is therefore not an ideal solution generate movement in a given direction. found, especially since no stepped 3. Device according to claim 2, characterized in that there is a 3 ° loose stop. indicates that there is no backlash between the. Finally, it is known that the between the screwed and the rotatable distance adjuster moved through the curves and the longitudinal gear member is effected by spring force (16). sliding part of the frame carrying the lenses 4. A device according to claim 2, characterized in that, when the Entfer is actuated, the movement transmission 35 voltage adjuster acts to focus the lens between the distance divider (6) and the diaphragm position, so that the Entferler (8) or occurs conductivities plate (7) by a pin voltage adjuster an inherent, to the linearized slot coupling, where a matched to the angle of rotation of the shutter plate, de-screwing participating pin (4 a) in fernungsskala results and that the aperture divider uneinem curved slot (7 c ) of the guide number 40 moved indirectly or via a linear gear in the ring (7). different relative positions, each different 5. Device according to one of claims 2.- correspond to guide numbers, can be coupled. That is, up to 4, in which the distance adjuster is the screw member for adjusting the focusing adjustment paths, characterized in that the aperture adjustment paths are instead of between the distance adjustment mechanism (6) or a part firmly connected to it 45 distance and aperture setting ring between distance is designed so that it arranges the clamping ring and the longitudinally displaceable mount part of the objective (2, 3) fixed to the sleeve. In order to avoid this resulting from the fact that the distance scale (6 a) at the disadvantages, a lens with its corresponding rear, the fixed part of the ob device was known, the extension movement of which is arranged with the lens (2, 3) facing end 50 means of a in a helical guide and that under this sleeve-shaped part a short slot engaging pin is effected, the venous guidelines (5c) being arranged, the guide slots being denoted by f-stop numbers differently from the helical shape and being cut in such a way that the distance adjuster is located ■ Unscrewing the distance ring (6) in Rieh- results in a logarithmic distance scale,
The proximity adjustment is becoming more and more visible 55 This known device is correct, whereby its intersection points with the rear edge are due and only requires little additional effort on the part of the distance ring (6). with worm gear and in addition, values in connection with the distance this arrangement indicate the outer dimensions of the scale. 60 lens hardly affected. With regard to the Adjustment of the lens extension values to the Interval angle of the diaphragm adjuster determined angle of rotation of the distance adjuster over a The invention relates to a photographic greater distance range has been found to be a disadvantage Objective with an execution for common ent- 65 out that the slope angle of the curvilinear Distance and aperture setting for flash photography Guide slot for the larger distance values with one next to the diaphragm divider and preferably very small at first, but that it is very fast concentric to it and grows with it, in order to finally determine the near values of the