EP2745159A1

EP2745159A1 - Adjustment device on an optical unit

Info

Publication number: EP2745159A1
Application number: EP12748405.3A
Authority: EP
Inventors: Armin Schlierbach; Dirk Luthardt; Sebastian KULESSA
Original assignee: Carl Zeiss Sports Optics GmbH
Current assignee: Carl Zeiss Sports Optics GmbH
Priority date: 2011-08-18
Filing date: 2012-07-27
Publication date: 2014-06-25
Also published as: WO2013023895A1; DE102011110991A1; US20140160561A1

Abstract

The invention relates to an adjustment device (100) having a mechanism for displacement of an assembly, in particular for the linear displacement (A1, A2) of at least one focussing lens (6) along an optical axis (A) of an optical unit, which mechanism can be driven in opposite rotation directions (D1, D2) by a rotary knob (1), wherein a rapid displacement of the assembly in a first direction (A1) takes place by means of the mechanism when the rotary knob (1) is rotated in the first rotation direction (D1) and a slow displacement of the assembly in an opposite direction (A2) takes place when the rotary knob (1) is rotated in the opposite rotation direction (D2) for a defined rotary angle. In order to simplify the construction, according to the invention the rotary knob (1) is connected in a rotationally fixed manner to an articulated axle (4), on the outside of which a first external thread (8) having a first steep pitch is formed at least in sections, wherein a driving nut (2) having a first internal thread (9) corresponding to the first external thread (8) is arranged rotatably on the first external thread (8), a second external thread (10) ) having a second, less steep pitch than the first pitch is formed at least in sections on the driving nut (2), wherein a driving piece (3) having a second internal thread (11) corresponding to the second external thread (10) is arranged rotatably on the second external thread (10), the driving piece (3) is connected to a dog (5) of the assembly for linear displacement (A1, A2) of the latter, wherein a stop (5a) extending in a linear manner is formed on the dog (5), and a stop segment (12) cut out over the defined rotary angle is formed on the driving nut (2).

Description

Description:

Adjustment device on an optical device

The invention relates to an adjusting device with a drivable with a knob in opposite directions of rotation transmission for moving an assembly, in particular for linear displacement of at least one focusing lens along an optical axis of an optical device, wherein upon rotation of the knob in the first direction of rotation via the transmission a fast Displacement of the assembly takes place in a first direction and upon rotation of the knob in the opposite direction of rotation for a defined

Angle of rotation occurs a slow displacement of the assembly in an opposite direction.

For optical devices such as monocular or binocular telescopes, riflescopes,

Microscopes or the like, usually within a tubular tube, at least one lens and an eyepiece arranged, optionally a reversing group and a further assembly to focus the optical device. This is done in the usual way a focusing lens, which is arranged linearly displaceable along an optical axis of the optical device. For example, in a monocular or binocular binoculars to be operated by a user knobs are provided, which are rotatable in opposite directions of rotation and cause the linear displacement of at least one focusing lens via a gear. Thus, the optical device, like binoculars, can be focused on different distances for accurately viewing an object. In the case of binocular binoculars, in particular the focusing lenses for both beam paths are displaced together via a gear or a rotary knob.

From US 5,689,366 an adjusting device for focusing a microscope is known, in which two rotary knobs are provided to allow a coarse and fine adjustment of the focusing. In the coarse adjustment, a rotational movement of a first rotary knob with a relatively large transmission ratio is transmitted through the transmission to a focusing lens, so that a rotation of the first knob by a certain angle of rotation relatively large stroke and thus causes a large change in the focus of the microscope. With a second knob, a more precise focus of the microscope can be made with a smaller gear ratio, since rotation of the second knob causes the same rotation angle due to the lower gear ratio only a smaller displacement, for example, a Fokussierlmse along the optical axis.

From DE 35 463 17 A1 a coarse and fine adjustment for an optical device is known, in which by means of a single knob via a transmission, a displacement of an assembly in particular for the linear displacement of at least one Fokussierlmse ausfuhrbar. In this case, by means of the rotary knob when actuated by a certain angle of rotation in a first

Direction of rotation to perform a coarse adjustment with large translation or large stroke of the assembly. If a focus point of the optical device just run over, so by means of the fine adjustment by rotation of the single knob in the opposite direction of rotation over the same rotation angle, a displacement of the assembly, ie in particular the Fokussierlmse, running with a lower gear ratio or a smaller stroke for exact focusing become. This is a

Temperature-dependent energy storage, for example in the form of a bimetallic spring necessary and a considerable design effort, so that especially during prolonged use wear or a significant need for maintenance can not be excluded.

Based on this prior art, therefore, the object is to improve an adjusting device for optical devices of the type mentioned in such a way that a coarse and fine adjustment is executable via a single knob, wherein a transmission for

Implementation of a rotary movement of the knob in a linear displacement of the assembly should have a relatively simple design effort.

According to the invention this object is achieved by an adjusting device with the features of claim 1.

In the adjusting device according to the invention, the knob is rotationally fixed with a

Joint axis connected, in turn, for example, in a tubular housing of a optical device is rotatably mounted but stationary. The joint axis can also be referred to as the transmission axis. At the hinge axis is on the outside circumference at least

partially formed a first external thread having a first large pitch. This external thread cooperates with a drive nut, which in turn has a first internal thread corresponding to the first external thread. The instinctual mother in turn is so forced that she is not, for example, due to

Frictional forces with the hinge axis can rotate. This means that a rotation of the rotary knob or the hinge axis results in a linear displacement of the drive nut along the axial extent of the hinge axis. Depending on the direction of rotation of the

Rotary knob or the hinge axis while the nut is displaced in a linear direction towards the knob or in the opposite direction. This is brought about by the fact that at least one protruding arm is formed on the drive nut, which interacts with a linear guide on an inner side, for example, on the tubular housing of the optical device. If the hinge axis is rotated, an unsupported drive nut would rotate with it, but since the projecting arm is guided in a linear guide which extends parallel to the axial extent of the hinge axis, the drive nut is forcibly displaced along the axial extent of the hinge axis.

On the drive nut in turn, on the outside, a second external thread at least

Sectionally formed on the circumference, which has a second smaller slope than the first major slope. This second external thread on the drive nut, in turn, cooperates with a drive piece, which is rotatable relative to the drive nut and, for this purpose, has a second internal thread corresponding to the second external thread on the drive nut. In this case, the gradients of the different steep threads or the respective static friction values and Gleitreibwerte between the components described above are chosen such that in a first direction of rotation, the drive piece always rotates together with the drive nut in a first direction of rotation or relatively does not shift.

In addition, on the drive nut a recessed over a defined angle of rotation

Stop segment formed, which is present in the first direction of rotation on the drive piece and this entrains together with the drive nut.

At the drive piece, for example, a radially outwardly facing double lever is formed, which with a parallel to the longitudinal axis of the hinge axis extending stop a Focusing rod cooperates or, for example, surrounds a circumferential shoulder on the stop of the focusing rod. Thus, the rotation of the knob in a first rotational direction via the axial displacement of the drive nut and the corresponding axial displacement of the drive piece also causes an axial displacement of the focusing rod, on the focusing rod, in turn, for example, a focus frame for a focusing lens is arranged so that by turning the knob in one of the first direction of rotation via the focusing rod, the focusing lens can be displaced in the linear direction, preferably along the optical axis of the optical device, in order to obtain an optical focusing to a desired distance.

In this case, the transmission described above is designed such that when turning the knob in the first direction of rotation, a so-called coarse adjustment takes place. This means that a slight rotation of the knob results in a large stroke or a relatively fast or strong axial displacement of the focusing lens, for example, 1mm stroke with a rotation of the knob by 1 °. If the exact focus point of the optical device has just been run over by means of the coarse adjustment, this can be visually perceived by a user and the further rotation in the first direction of rotation can be ended. Subsequently, the knob is in the opposite second

Direction of rotation actuated. This results in an opposite axial displacement of the drive nut.

Because, however, at the drive nut the recessed over a defined angle of rotation

Stop segment is formed, now the drive piece is no longer driven directly from the drive nut or taken away. The drive piece in turn is on the above-described double lever in the circumferential direction over the stop of the

Focusing rod defined as described above, the drive nut in a linear guide so that it does not rotate with respect to the drive nut, but rotated due to the lower pitch of the second external thread of the drive nut or the second internal thread of the drive piece with a lower pitch relative to the drive nut. In this case, there is an axial displacement of the focusing rod in the opposite direction to the above-described coarse adjustment. Due to the lower thread pitch but here only a lesser stroke or only a relatively slow or weak axial displacement is generated at a same angle of rotation. For example, a rotation around 120 ° only mean a stroke of 1cm, so that a fine adjustment is realized in order to set the focusing lens in the opposite direction of linear movement exactly to the focus point can.

The stopper segment is designed such that it is recessed over the defined rotation angle, which means that upon rotation of the rotary knob up to this defined rotation angle, a fine adjustment takes place. Subsequently, the drive piece is again on the stop segment of the drive nut and is taken away by this on the larger pitch of the first external thread in turn with increased stroke.

The pitch ratios of the respective threads can be chosen such that a desired ratio for coarse and fine adjustment is obtained relative to each other. Likewise, the materials of the individual components can be chosen such that, in particular when turning back the Feinversteilung in the second direction of rotation, the drive piece rotates relative to the drive nut with relatively little resistance. In particular, a

Material combination can be chosen such that even with different

Ambient temperatures the functionality described above is maintained.

The advantage of the invention is that only a few components are needed to obtain a coarse and fine adjustment with different stroke at the same angle of rotation, so that in particular practically no maintenance is required and mechanical damage due to only rotating or linearly moving components is practically excluded.

Advantageous embodiments of the invention are the subject of dependent claims.

For the design of the optical device is proposed that it is a monocular or binocular telescope, so colloquially to a spotting scope or binoculars. Here, the operability is greatly facilitated by the combination of coarse and fine adjustment in a single knob. For example, a binocular

Binoculars held with one hand while adjusting the sharpness. The focusing lenses in both tubes are driven by a common gear.

Likewise, the optical device may be, for example, a microscope. To select the defined angle of rotation is proposed that this is 120 degrees or a third circle. With this angle selection is a sufficient stroke for a

Fine adjustment given, which is usually carried out relatively slowly and thus exactly adjustable. In principle, however, other arbitrary angles of rotation can be selected, for example 90 degrees, 150 degrees, 180 degrees, or any angle between them. By using one or more trailing wheels, a defined angle of rotation greater than 360 ° can also be realized.

In order to ensure the rotation of the drive piece relative to the drive nut and the drive nut relative to the hinge axis, especially in the second opposite direction of rotation for Femverstellung, not only different material combinations can be selected by the skilled person for the different thread as described above, but also different lubricants are used To achieve, for example, that between the drive unit and drive nut lower static and / or sliding friction forces exist as between drive nut and hinge axis.

Preferably, different materials for the individual components and / or threads are used. This can for example be designed such that drive nut or drive piece are a plastic component and the respective other component is formed of a metallic material. In principle, it is also included that only the threads themselves are made in different materials. For example, the drive piece is a metallic component with an external thread made of plastic or vice versa.

In addition, an O-ring, for example made of a silicone material between the knob and drive nut can be arranged on the hinge axis, in addition to act as a driver for the drive nut.

It is understood that the features mentioned above and those yet to be explained not only in the combination given, but also in others

Combinations or alone, without departing from the scope of the present invention. Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

Figure 1: a stepped drive in side view and

Figure 2: a stepped drive in plan view.

1 shows an adjustment device 100 in a side view or in FIG. 2 along the dot-dash line H-H in FIG. 1 in plan view. The

An optical device adjusting device 100 such as a monocular or binocular telescope, a microscope, or the like includes a gear composed of a plurality of components. A rotary knob 1 is rotatable as shown by the double arrow D and the direction of rotation arrows D1 and D2 in Figure 2 in opposite directions. The knob 1 is rotationally connected to a hinge axis 4 and / or formed integrally therewith, which in turn is preferably rotatably mounted in a not shown here for simplicity of illustration tube-shaped tube of an optical device, but stationary. On the outside of the hinge axis 4, at least in sections, a first external thread 8 is formed with a first large pitch. On the first external thread 8 a drive nut 2 is rotatably mounted relative to the hinge axis 4. If the knob 1 and thus the hinge axis 4 is rotated, first the drive nut 2 would rotate with the hinge axis 4. However, the drive nut 2 is designed such that, for example, a projecting arm 15 is provided which is guided in a linear guide preferably parallel to the optical axis A of the optical device, so that the rotational movement D of the rotary knob 1 and the hinge axis 4 in a linear

Displacement A1, A2 is implemented as indicated by the arrows. Depending on the direction of rotation D1, D2, an axial displacement takes place in the direction A1, A2 or vice versa.

For this purpose, a first internal thread 9 corresponding to the first external thread 8 is formed with the same pitch on the drive nut 2. On the outside of the drive nut 2, in turn, a second external thread 10 is at least partially formed on the circumference thereof with a second smaller pitch than the first large pitch of the first

External thread 8. On this second external thread 10 turn a drive piece 3 is rotatably mounted relative to the drive nut 2, which for this purpose equipped with a second external thread 10 corresponding second internal thread 11 with the second smaller pitch is. The drive piece 3 has a radially nacn n facing double lever 13 or driver, as shown in Figure 2, which cooperates with a stop 5a described below.

For optical focusing of the optical device is a focusing lens 6, which is linearly displaceable along an optical axis A in the direction A1, A2. The focusing lens 6 is held, for example, in a focusing mount 7, which in turn is axially displaceable by means of a focusing rod 5. On the Fokussierstange 5 is a parallel to the optical axis A linearly extending stop 5a is formed. At the stop 5a a circumferential shoulder 16 is formed, which cooperates with the double lever 13. In this case, the focusing rod 5 is mounted, for example, in a tubular housing of the optical device such that it can be displaced parallel to the optical axis A.

Now, if the knob 1 is rotated, for example, in the first direction of rotation D1, the drive nut 2 moves due to the linear guide by the projecting arm 15 in the axial direction, for example, in the direction AI relative to the hinge axis 4. This is the drive unit 3 and accordingly on the double lever 13 and the circumferential shoulder 16 of the stop 5a or the focusing rod 5 taken in the same axial direction AI. For this purpose, the pitch of the first external thread 8 is preferably designed such that a large stroke is achieved, which means a coarse adjustment in which a slight twisting D 1 of the rotary knob 1 results in a large axial displacement, for example A1 of the focusing rod 5 or the focusing lens 6.

Now is the focus point of the optical device, so to speak, "run over", the

Rotary movement in the first direction of rotation D1 of the knob 1 is terminated by the user and

subsequently turned back the knob 1 in the opposite direction D2. In this case, a stopper segment 12 is formed on the drive nut 2, which is recessed over a defined rotation angle, for example 120 °. This means that the drive nut 2 is not present at the stop 5a of the focusing rod 5 and thus a. About this defined rotation angle

Relative movement between stop 5a or drive piece 3 and drive nut 2 is possible. The pitch of the second external thread 10 on the drive nut 2 and the second internal thread 1 1 on the drive unit 3 is less than the first major pitch. Thus, the drive piece 3 relatively displaced in the opposite axial direction A2 to the drive nut 2, wherein due to the smaller pitch of the second external thread 10, a smaller stroke is realized at the same angle of rotation. Thus, a fine adjustment of the optical device or the focusing lens 6 can be achieved. If the drive nut 2 in the second, opposite rotational direction D2 turned so far that the stopper segment 12 is fully utilized and the nut 2 in turn abuts the stop 5a of the focusing rod 5, the drive unit 3 is taken again and a renewed larger stroke or a coarse adjustment takes place ,

The materials of the individual components of the transmission of the adjusting device 100 can be selected by the skilled person in any way, conceivable are, for example, the

Combinations of different metallic and / or plastic materials. Likewise, different lubricants may be provided to over large

Temperature ranges, the desired adhesion and / or sliding friction of the

get different thread, so that the above-described coarse and

Fine adjustment is possible. In addition, an O-ring 14 may be provided, for example, of silicone, to act as an additional driver for the drive nut 2.

List of reference numbers:

1 knob

2 nut

3 drive piece

4 joint axis

5 focusing rod

5a stop of the focusing rod

6 focusing lens

7 focus detection

8 First external thread

9 First internal thread

10 second external thread

11 Second internal thread

12 stop segment

13 double levers

14 O-ring

15 15 protruding arm

16 All-round shoulder 100 adjustment device

D direction of rotation

D1 First direction of rotation

D2 Second direction of rotation

A Optical axis

AI first linear shift

A2 second linear displacement

Claims

claims:

1. adjusting device (100) having a with a knob (1) in opposite directions of rotation (D1, D2) driven gear for displacing an assembly, in particular for the linear displacement (A1, A2) at least one focusing lens (6) along an optical axis ( A) of an optical device, wherein upon rotation (D) of the rotary knob (1) in the first rotational direction (D1) via the transmission, a rapid displacement of the assembly takes place in a first direction (A1) and upon rotation of the rotary knob (1) in the opposite direction of rotation (D2) for a defined angle of rotation a slow displacement of the assembly takes place in an opposite direction (A2), characterized in that the rotary knob (1) is rotationally connected to a hinge axis (4) on the outside at least

a first external thread (8) is formed with a first large pitch in sections, wherein on the first external thread (8) a drive nut (2) with the first external thread (8) corresponding first internal thread (9) is rotatably arranged on the drive nut (2 ) a second external thread (10) is formed at least in sections with a second smaller pitch than the first major pitch, wherein on the second external thread (10) a driving piece (3) with the second external thread (10) corresponding second internal thread (1 1) rotatable is arranged, the drive piece (3) for linear displacement (A1, A,) of a driving rod (5) of the assembly is connected thereto, wherein on the driving rod (5) is a linearly extending stop (5a) is formed, and on the Drive nut (2) is formed over the defined rotation angle recessed stop segment (12).

2. adjustment (100) according to claim 1, characterized in that the optical device is a monocular or binocular telescope.

3. adjusting device (100) according to claim 1 or 2, characterized in that the defined rotation angle is 120 °.

4. adjusting device (100) according to an aer claims 1 to 3, characterized in that on the threads (8, 9, 10, 1 1) lubricant, in particular different lubricants are provided.

5. Adjusting device (100) according to one of claims 1 to 4, characterized in that the threads (8, 9, 10.1 1) are constructed of materials having different adhesive and / or sliding friction coefficient.

6. adjusting device (100) according to one of claims 1 to 5, characterized in that an O-ring (14) is provided.