CA2024483A1 - Field-glass - Google Patents
Field-glassInfo
- Publication number
- CA2024483A1 CA2024483A1 CA 2024483 CA2024483A CA2024483A1 CA 2024483 A1 CA2024483 A1 CA 2024483A1 CA 2024483 CA2024483 CA 2024483 CA 2024483 A CA2024483 A CA 2024483A CA 2024483 A1 CA2024483 A1 CA 2024483A1
- Authority
- CA
- Canada
- Prior art keywords
- ring
- stop
- field
- knurled
- glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000011521 glass Substances 0.000 title claims abstract description 55
- 230000004438 eyesight Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 206010019233 Headaches Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
Landscapes
- Telescopes (AREA)
Abstract
A B S T R A C T
Field-Glass In a field-glass the ocular-columns are joined together by means of a bridge and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing. Fixed focus adjustability is provided, according to the invention, by a central focusing device locked by means of a knurled ring, and dual-focusing adjustment is provided by an axially adjustable stop-ring, focusing being normally effected by releasing the lock by means of the knurled ring and eliminating the stop by means of the stop-ring.
Field-Glass In a field-glass the ocular-columns are joined together by means of a bridge and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing. Fixed focus adjustability is provided, according to the invention, by a central focusing device locked by means of a knurled ring, and dual-focusing adjustment is provided by an axially adjustable stop-ring, focusing being normally effected by releasing the lock by means of the knurled ring and eliminating the stop by means of the stop-ring.
Description
2 ~ 2 ~
S P E C I F I C A T I O N
The invention relates to a field-glass the ocular columns of which are joined together by means of a bridge and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing.
The field-glass according to the invention is a binocular. The bridge uniting the two oculars can be adjusted to a fixed distance between the eyes. However, it is preferably in the form of a folding bridge for individual adjustment to the distance between the user's eyes. In addition to this it is possible with this field-glass to carry out normal focusing for those wearing glasses, and for the normally sighted, using the ocular columns and the central focusing device. In the case of those who do not wear their glasses when using the field-glass one or both oculars are provided with individual focusing. This allows the field-glass to be adapted to the varying requirements of the market.
The central focusing device of the field-glass according to the invention may be of any conventional construction. For example, the knurled element may be in the form of a knurled wheel, a knurled screw or a knurled roller.
While knurled rollers may be accommodated in the bridge, as is known, knurled wheels or discs may be arranged above or below the bridge. These possible designs according to the invention permit adaption to varying requirements.
The invention is based upon known field-glasses comprising the central-focusing device already described and using individual ocular adjustment. The said central-focusing device may also comprise a focusing rocker; field-glasses of this kind have the advantage that they can be adjusted individually to the eyes of any user. As is known, this is effected in that the field-glass is adjusted to a specific distance, e.g. 150 m, taking into account the depth of focus.
In this case the individual adjustment is carried out by the user who generally rotates a diopter-ring on one or both oculars. Once the adjustment has been made each focusing range can be adjusted by rotating the central focusing device, and there is no need for the user to wear his glasses.
The disadvantage is that matching the field-glass to the eyes of the user raises major individual problems, as a result of which many persons are unable to use the field-glass correctly.
Attempts have therefore been made to make it easier for the user to adjust the field-glass. One such field-glass having simplified adjustment makes use of a single-ocular adjustment.
In this case focusing is adjusted by rotating the left or right-hand diopter-ring, while the distance is adjusted at the same time. The disadvantage of this is that once the focus has been adjusted it can be altered only by resetting both oculars.
~5 This lengthens the time required to change the focus. In practice, this means that focusing often takes too long.
Another attempt to make focusing of the field-glass easier for the user involves providing it with a fixed-focus adjustment. In this case the lens-system is set to about 70 to 80 m. It is therefore impossible to change the focus. Under normal viewing and with 20/20 vision in both eyes, or in the case of a person wearing glasses, such field-glasses may be used without making any adjustment, although only objects within about 14 to 80m appear sharply focused. These field-glasses have the disadvantage that, because of the fixed focus, details at infinity are not sharply focused and the ability of the eyes to accommodate must be counted upon. This, however, leads to e~e-strain and headaches. In addition to this the close range available is at the most 14 m. At less than this details are again not in sharp focus. Moreover, persons having problems in one or both eyes cannot normally use such field-glasses without optical aids, for example, in the form of glasses.
It is the purpose of the invention to provide a field-glass which, in a simple manner, ensures that the user can adjust it properly and which largely eliminates the aforesaid disadvantages.
In accordance with the invention a field-glass, the ocular columns of which are joined together by means of a bridse and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing, is characterized by fixed-focus adjustability by the central focusing device when locked by means of a knurled ring, and dual-focus adjustment provided by an axially ~7~ 3 adjustable stop-ring on the guide-pin, focusing being normally effected by releasing the lock by means of the knurled ring and eliminating the stop by means of the stop-ring.
The said field-glass, comprising a central focusing device for adjustment for all distances, is fitted with an additional knurled ring and stop-ring providing two further means of adjustment. This permits fixed-focus adjustment, the disadvantage of ~hich is eliminated by a dual focus adjustment.
Thus dual-focus adjustment makes it possible to use fixed-focus adjustments for close range, for example between 6 and 14 m, and for long range, for example between 14 m and infinity. Since the basic design of the field-glass is nGt altered in any way by the invention, it can be used by those with normal eyesight and those with defective eyesight who use the field-glass, with or without visual aids.
The invention has the advantage that, by using the dual focus adjustment, the field-glass may be used immediately for all ranges, a change-over to close-range fixed focus or to long-range fixed focus requiring merely resetting of the drive.
On the other hand, the field-glass according to the invention may be used as a conventional instrument capable of being set to any desired focus. By using the dual-focus setting, unskilled users can largely eliminate errors. Skilled persons can use the field-glass in the normal manner, but can also make use of the advantages of a fixed-focus setting which allows the user to adjust the field-glass substantially faster for objects at different distances.
~`2 -eii~ ~3 Preferably a fixed tube secured to the guide-pin and a clamping ring co-operating with the knurled ring are used for fixed-focus adjustment, the said fixed tùbe being released for normal adjustment. This provides a simple design of fixed-focus adjustment for each range and a simple change-over to the conventional normal setting.
Preferably also the stop-ring is connected to a thread on the guide pin and co-operates with the fixed tube. In this aspect the invention combines the said fixed-focus adjustment with the stop-ring, thus simplifying the design still further.
These additional adjustments of the field-glass according to the invention are to be carried out correctly even when the field-glass is being held up to the eyes. Thus, preferably the knurled ring used for locking and the stop-ring are arranged below the bridge and the guide pin comprises an extension upon which the tube is arranged between a flange on the said extension and the stop-ring the clamping ring being secured to the guide of the focusing device. In this case the two additional settings offered by the invention are arranged in an axial extension of the normal setting.
Also preferably the thread consists of an internal thread located in an extension of the stop-ring and of an external thread fitted to the end, in the form of a splndle, of the guide pin, the outer annular surfaces of the tube and the inner annular surfaces of the extension serving as stop surfaces. This ensures accurate operation of the stop-ring by ~ ~ 2 ~ 3 dividing the stop over a plurality of annular surfaces which bear against each other.
Details, additional characteristics and other advantages of the invention may be gathered from the following description of a specific embodiment, in conjunction with the drawings attached hereto, wherein:
Fig. 1 is a partial elevation and partial cross-section view of a field-glass according to the invention, the parts constituting the drive for the ocular columns being shown in cross-section;
Fig. 2 shows the relative position of the drive parts in the fixed-focus setting;
Fig. 3 shows the relative position of the drive parts in one dual-focus setting; and Fig. 4 shows the relative position of the drive parts in the other dual-focus setting.
The field-glass indicated generally by reference is a prismatic glass in which the distance between the objectives, not shown, is greater than that between the oculars 2, only one of which is shown. A prism housing 3 serves as a guide for the respective ocular column 4, the columns being joined together by a folding bridge 8. A central focusing device 6 is disposed along the optical centre-line between two bridge-hinges 7 and joining the two prism housings together. The focusing device has two moving parts, namely a knurled roller 9 and a guide-pin 10, these parts being complemented by a fixed tube 11. A
2 ~
guide-pin 12 runs in a spiral guide-groove 13 which is formed in the inner cylindrical surface of the said knurled roller. ~pon multipartite locking, by fixing the guide-pin 10 to bridge 5, by means shown at 14, the two ocular columns 4 are moved simultaneously in one of the two directions.
In a manner explained hereinafter in greater detail, the field-glass is provided with fixed-focus adjustability by means of the central focusing device 6 and a knurled ring 15 which can be locked. This permits a dual-focus setting which is brought about by an axially adjustable stop-ring 16. To provide the additional parts required the guide pin 10 is extended by an extension axle 17 which is secured at 18 in the end-face of the guide pin. Extension axle 17 passes through a flanged screw 19 which engages lower hinge-parts 8 and is screwed into the lower end of the tube 11.
As may be seen more particularly in Figs. 2 and 3, a bushing 20 is seated upon a flanged screw 19, the said bushing accommodating the inner radially upwardly directed flange of a clamping ring 21 in a groove in the cylindrical surface thereof. The said clamping ring has inwardly directed jaws 22 and, on its upper cylindrical part, an external thread upon which the internal thread of knurled ring 15 rotates. The jaws 22 of the knurled ring 15 act upon a fixed tube 30 (Fig. 1) which can be braced between the lower annular end-surface 31 of a counterbase recess 32 in the said fixed tube 30 and the facing annular surface of the flange 23; the extension 25 of stop-ring ~v ~ 2 ~
16 is within this recess 32. As shown by a comparison between Figs. 1 and 2 the jaws 22 are released as soon as knurled ring 15 reaches its position shown in Fig. 1, i.e. further from hinge-parts 8. The said jaws are closed as soon as the clamping reaches its upper position, visible in Figs. 2 and 3.
Extension 17 to the pin 10 carries intermediate its ends a cylindrical flange 23 and has a threaded spindle 24 at its free end. Running on the spindle is the internal thread of an extension 25 which is integral with the stop-ring 16, the latter having a central cylindrical base 26 which normally is covered with a plate 27 to conceal a grub-screw 28 having a head 29, the said grub-screw being screwed into the free end-face of extension 17.
The field-glass described is operated as follows:
In order to arrive at the basic setting the knurled ring 15 is rotated to the position shown in Fig. 1 to cause jaws 22 to release the fixed tube 30. With the right-hand thread normally provided this is accomplished by rotating ring 15 to the left. Thereafter, the knurled stop-ring 16 is moved to the position shown in Figs. 1 and 2, i.e. with the right-hand thread normally provided, it is rotated to the right until the aforesaid stop-surfaces engage one another with the tube 30 interposed between flange 23 and the flange of the stop-ring 16. The user now before sighting aims at an object at a distance of about 150m and adjusts the focus by rotating the knurled roller 9 of the central focusing device 6. As soon as ~ ~ 2 '~ 3 this has been done the knurled ring 15 is tightened to the position shown in Fig. 2 to allow jaws 22 to grip tube 30, this being done by rotation to the right. The field-glass is then in the fixed-focus setting, i.e. the focus is set to between about lS m and infinity.
The dual-focus setting is obtained upon positioning of the parts described as shown in Fig. 3 or as shown in Fig. 4.
To this end the stop-ring 16 is rotated to the left as far as it can to the stop, i.e. until extension 25 of the stop-ring 16 rests upon the lower annular surface of head 29 of grub-screw 28. If the user now rotates the central focusing device to the right as far as the stop position shown in Fig. 3 the field-glass is set for long range, while if it is rotated to the left until a stop is again obtained with the flange 23 against the flanged screw 19, as shown in Fig. 4, and the stop-ring flange 16 against the fixed tube 30 the field-glass is set for close range. The setting shown in Fig. 3 is the usual setting for using the field-glass.
If the field-glass is to be set, in the conventional manner, to be adjustable to various ranges, all that is needed is to release knurled ring 15 by rotating it to the left releasing the jaws 22; this allows the central focusing device to be actuated over the full range.
In this embodiment the field-glass is provided with an individual diopter ring 33; this allows it to be adjusted for users who normally require a visual aid but do not wish to wear it while using the field-glass.
g 3 Also with this embodiment after knurled ring 15 has been released full movement of the guide pin 12 in groove 13, in the upward direction, causes bridge 5 to move for full extension of the ocular columns to give close range viewing by rotating knurled roller 9 to the left. Rotating the roller to the right causes the pin 12 to move downwardly and ocular columns to move to the infinity range.
S P E C I F I C A T I O N
The invention relates to a field-glass the ocular columns of which are joined together by means of a bridge and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing.
The field-glass according to the invention is a binocular. The bridge uniting the two oculars can be adjusted to a fixed distance between the eyes. However, it is preferably in the form of a folding bridge for individual adjustment to the distance between the user's eyes. In addition to this it is possible with this field-glass to carry out normal focusing for those wearing glasses, and for the normally sighted, using the ocular columns and the central focusing device. In the case of those who do not wear their glasses when using the field-glass one or both oculars are provided with individual focusing. This allows the field-glass to be adapted to the varying requirements of the market.
The central focusing device of the field-glass according to the invention may be of any conventional construction. For example, the knurled element may be in the form of a knurled wheel, a knurled screw or a knurled roller.
While knurled rollers may be accommodated in the bridge, as is known, knurled wheels or discs may be arranged above or below the bridge. These possible designs according to the invention permit adaption to varying requirements.
The invention is based upon known field-glasses comprising the central-focusing device already described and using individual ocular adjustment. The said central-focusing device may also comprise a focusing rocker; field-glasses of this kind have the advantage that they can be adjusted individually to the eyes of any user. As is known, this is effected in that the field-glass is adjusted to a specific distance, e.g. 150 m, taking into account the depth of focus.
In this case the individual adjustment is carried out by the user who generally rotates a diopter-ring on one or both oculars. Once the adjustment has been made each focusing range can be adjusted by rotating the central focusing device, and there is no need for the user to wear his glasses.
The disadvantage is that matching the field-glass to the eyes of the user raises major individual problems, as a result of which many persons are unable to use the field-glass correctly.
Attempts have therefore been made to make it easier for the user to adjust the field-glass. One such field-glass having simplified adjustment makes use of a single-ocular adjustment.
In this case focusing is adjusted by rotating the left or right-hand diopter-ring, while the distance is adjusted at the same time. The disadvantage of this is that once the focus has been adjusted it can be altered only by resetting both oculars.
~5 This lengthens the time required to change the focus. In practice, this means that focusing often takes too long.
Another attempt to make focusing of the field-glass easier for the user involves providing it with a fixed-focus adjustment. In this case the lens-system is set to about 70 to 80 m. It is therefore impossible to change the focus. Under normal viewing and with 20/20 vision in both eyes, or in the case of a person wearing glasses, such field-glasses may be used without making any adjustment, although only objects within about 14 to 80m appear sharply focused. These field-glasses have the disadvantage that, because of the fixed focus, details at infinity are not sharply focused and the ability of the eyes to accommodate must be counted upon. This, however, leads to e~e-strain and headaches. In addition to this the close range available is at the most 14 m. At less than this details are again not in sharp focus. Moreover, persons having problems in one or both eyes cannot normally use such field-glasses without optical aids, for example, in the form of glasses.
It is the purpose of the invention to provide a field-glass which, in a simple manner, ensures that the user can adjust it properly and which largely eliminates the aforesaid disadvantages.
In accordance with the invention a field-glass, the ocular columns of which are joined together by means of a bridse and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing, is characterized by fixed-focus adjustability by the central focusing device when locked by means of a knurled ring, and dual-focus adjustment provided by an axially ~7~ 3 adjustable stop-ring on the guide-pin, focusing being normally effected by releasing the lock by means of the knurled ring and eliminating the stop by means of the stop-ring.
The said field-glass, comprising a central focusing device for adjustment for all distances, is fitted with an additional knurled ring and stop-ring providing two further means of adjustment. This permits fixed-focus adjustment, the disadvantage of ~hich is eliminated by a dual focus adjustment.
Thus dual-focus adjustment makes it possible to use fixed-focus adjustments for close range, for example between 6 and 14 m, and for long range, for example between 14 m and infinity. Since the basic design of the field-glass is nGt altered in any way by the invention, it can be used by those with normal eyesight and those with defective eyesight who use the field-glass, with or without visual aids.
The invention has the advantage that, by using the dual focus adjustment, the field-glass may be used immediately for all ranges, a change-over to close-range fixed focus or to long-range fixed focus requiring merely resetting of the drive.
On the other hand, the field-glass according to the invention may be used as a conventional instrument capable of being set to any desired focus. By using the dual-focus setting, unskilled users can largely eliminate errors. Skilled persons can use the field-glass in the normal manner, but can also make use of the advantages of a fixed-focus setting which allows the user to adjust the field-glass substantially faster for objects at different distances.
~`2 -eii~ ~3 Preferably a fixed tube secured to the guide-pin and a clamping ring co-operating with the knurled ring are used for fixed-focus adjustment, the said fixed tùbe being released for normal adjustment. This provides a simple design of fixed-focus adjustment for each range and a simple change-over to the conventional normal setting.
Preferably also the stop-ring is connected to a thread on the guide pin and co-operates with the fixed tube. In this aspect the invention combines the said fixed-focus adjustment with the stop-ring, thus simplifying the design still further.
These additional adjustments of the field-glass according to the invention are to be carried out correctly even when the field-glass is being held up to the eyes. Thus, preferably the knurled ring used for locking and the stop-ring are arranged below the bridge and the guide pin comprises an extension upon which the tube is arranged between a flange on the said extension and the stop-ring the clamping ring being secured to the guide of the focusing device. In this case the two additional settings offered by the invention are arranged in an axial extension of the normal setting.
Also preferably the thread consists of an internal thread located in an extension of the stop-ring and of an external thread fitted to the end, in the form of a splndle, of the guide pin, the outer annular surfaces of the tube and the inner annular surfaces of the extension serving as stop surfaces. This ensures accurate operation of the stop-ring by ~ ~ 2 ~ 3 dividing the stop over a plurality of annular surfaces which bear against each other.
Details, additional characteristics and other advantages of the invention may be gathered from the following description of a specific embodiment, in conjunction with the drawings attached hereto, wherein:
Fig. 1 is a partial elevation and partial cross-section view of a field-glass according to the invention, the parts constituting the drive for the ocular columns being shown in cross-section;
Fig. 2 shows the relative position of the drive parts in the fixed-focus setting;
Fig. 3 shows the relative position of the drive parts in one dual-focus setting; and Fig. 4 shows the relative position of the drive parts in the other dual-focus setting.
The field-glass indicated generally by reference is a prismatic glass in which the distance between the objectives, not shown, is greater than that between the oculars 2, only one of which is shown. A prism housing 3 serves as a guide for the respective ocular column 4, the columns being joined together by a folding bridge 8. A central focusing device 6 is disposed along the optical centre-line between two bridge-hinges 7 and joining the two prism housings together. The focusing device has two moving parts, namely a knurled roller 9 and a guide-pin 10, these parts being complemented by a fixed tube 11. A
2 ~
guide-pin 12 runs in a spiral guide-groove 13 which is formed in the inner cylindrical surface of the said knurled roller. ~pon multipartite locking, by fixing the guide-pin 10 to bridge 5, by means shown at 14, the two ocular columns 4 are moved simultaneously in one of the two directions.
In a manner explained hereinafter in greater detail, the field-glass is provided with fixed-focus adjustability by means of the central focusing device 6 and a knurled ring 15 which can be locked. This permits a dual-focus setting which is brought about by an axially adjustable stop-ring 16. To provide the additional parts required the guide pin 10 is extended by an extension axle 17 which is secured at 18 in the end-face of the guide pin. Extension axle 17 passes through a flanged screw 19 which engages lower hinge-parts 8 and is screwed into the lower end of the tube 11.
As may be seen more particularly in Figs. 2 and 3, a bushing 20 is seated upon a flanged screw 19, the said bushing accommodating the inner radially upwardly directed flange of a clamping ring 21 in a groove in the cylindrical surface thereof. The said clamping ring has inwardly directed jaws 22 and, on its upper cylindrical part, an external thread upon which the internal thread of knurled ring 15 rotates. The jaws 22 of the knurled ring 15 act upon a fixed tube 30 (Fig. 1) which can be braced between the lower annular end-surface 31 of a counterbase recess 32 in the said fixed tube 30 and the facing annular surface of the flange 23; the extension 25 of stop-ring ~v ~ 2 ~
16 is within this recess 32. As shown by a comparison between Figs. 1 and 2 the jaws 22 are released as soon as knurled ring 15 reaches its position shown in Fig. 1, i.e. further from hinge-parts 8. The said jaws are closed as soon as the clamping reaches its upper position, visible in Figs. 2 and 3.
Extension 17 to the pin 10 carries intermediate its ends a cylindrical flange 23 and has a threaded spindle 24 at its free end. Running on the spindle is the internal thread of an extension 25 which is integral with the stop-ring 16, the latter having a central cylindrical base 26 which normally is covered with a plate 27 to conceal a grub-screw 28 having a head 29, the said grub-screw being screwed into the free end-face of extension 17.
The field-glass described is operated as follows:
In order to arrive at the basic setting the knurled ring 15 is rotated to the position shown in Fig. 1 to cause jaws 22 to release the fixed tube 30. With the right-hand thread normally provided this is accomplished by rotating ring 15 to the left. Thereafter, the knurled stop-ring 16 is moved to the position shown in Figs. 1 and 2, i.e. with the right-hand thread normally provided, it is rotated to the right until the aforesaid stop-surfaces engage one another with the tube 30 interposed between flange 23 and the flange of the stop-ring 16. The user now before sighting aims at an object at a distance of about 150m and adjusts the focus by rotating the knurled roller 9 of the central focusing device 6. As soon as ~ ~ 2 '~ 3 this has been done the knurled ring 15 is tightened to the position shown in Fig. 2 to allow jaws 22 to grip tube 30, this being done by rotation to the right. The field-glass is then in the fixed-focus setting, i.e. the focus is set to between about lS m and infinity.
The dual-focus setting is obtained upon positioning of the parts described as shown in Fig. 3 or as shown in Fig. 4.
To this end the stop-ring 16 is rotated to the left as far as it can to the stop, i.e. until extension 25 of the stop-ring 16 rests upon the lower annular surface of head 29 of grub-screw 28. If the user now rotates the central focusing device to the right as far as the stop position shown in Fig. 3 the field-glass is set for long range, while if it is rotated to the left until a stop is again obtained with the flange 23 against the flanged screw 19, as shown in Fig. 4, and the stop-ring flange 16 against the fixed tube 30 the field-glass is set for close range. The setting shown in Fig. 3 is the usual setting for using the field-glass.
If the field-glass is to be set, in the conventional manner, to be adjustable to various ranges, all that is needed is to release knurled ring 15 by rotating it to the left releasing the jaws 22; this allows the central focusing device to be actuated over the full range.
In this embodiment the field-glass is provided with an individual diopter ring 33; this allows it to be adjusted for users who normally require a visual aid but do not wish to wear it while using the field-glass.
g 3 Also with this embodiment after knurled ring 15 has been released full movement of the guide pin 12 in groove 13, in the upward direction, causes bridge 5 to move for full extension of the ocular columns to give close range viewing by rotating knurled roller 9 to the left. Rotating the roller to the right causes the pin 12 to move downwardly and ocular columns to move to the infinity range.
Claims (7)
1. A field-glass, the ocular columns of which are joined together by means of a bridge and are actuated by means of a central focusing device comprising a drive consisting of a rotatable knurled element and a guide-pin, the said central focusing device being used for normal focusing, characterized by fixed-focus adjustability by the central focusing device when locked by means of a knurled ring, and dual-focus adjustment being provided by an axially adjustable stop-ring on the guide-pin, focusing being normally effected by releasing the lock by means of the knurled ring and eliminating the stop by means of the stop-ring.
2. A field-glass according to claim 1, characterized in that a fixed tube secured to the guide-pin and a clamping ring co-operating with the knurled ring are used for fixed-focus adjustment, the said fixed tube being released for normal adjustment.
3. A field-glass according to claim 1, characterized in that the stop-ring is connected to a thread on the guide pin and co-operates with the fixed tube.
4. A field-glass according to claim 2, characterized in that the stop-ring is connected to a thread on the guide pin and co-operates with the fixed tube.
5. A field-glass according to any one of claims 1 to 4, characterized in that the knurled ring used for locking and the stop-ring are arranged below the bridge and the guide pin comprises an extension upon which the tube is arranged between a flange on the said extension and the stop-ring; the clamping ring being secured to the guide of the focusing device.
6. A field-glass according to any one of claims 1 to 4, characterized in that the thread consists of an internal thread located in an extension of the stop-ring and of an external thread fitted to the end, in the form of a spindle, of the guide pin, the outer annular surfaces of the tube and the inner annular surfaces of the extension serving as stop-surfaces.
7. A field-glass according to any one of claim 1 to 4, characterized in that a stop member for the stop-ring and the stop-ring extension is defined by the head of a grub-screw located in the end-face of the guide pin.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3933793.6 | 1989-10-10 | ||
| DE19893933793 DE3933793A1 (en) | 1989-10-10 | 1989-10-10 | BINOCULARS |
| EP19890120421 EP0422285A3 (en) | 1989-10-10 | 1989-11-04 | Telescope |
| EP89120421.6 | 1989-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2024483A1 true CA2024483A1 (en) | 1991-04-11 |
Family
ID=25885971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2024483 Abandoned CA2024483A1 (en) | 1989-10-10 | 1990-08-31 | Field-glass |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH03126905A (en) |
| CA (1) | CA2024483A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112009001210T5 (en) | 2008-06-06 | 2011-03-31 | J.Morita Manufacturing Corp., KYOTO-SHI | Imaging device used for dental treatment and device for dental treatment equipped with an image pickup device |
-
1990
- 1990-02-15 JP JP3263190A patent/JPH03126905A/en active Pending
- 1990-08-31 CA CA 2024483 patent/CA2024483A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03126905A (en) | 1991-05-30 |
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