DE1225878B - Periscope sextant - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

Number:
File number:
Registration date:
Display day:

GOIc

German class: 42 c - 37

K43989IXb / 42c
June 13, 1961
September 29, 1966

The invention relates to a periscope sextant, in which the image of a crosshair over a semi-transparent mirror and a pendulum mirror is reflected in the observation field of view, the crosshairs through a Light source is illuminated via a condenser.

The invention is based on the object of a periscope sextant of this type which is known per se to carry out additional reflection of an azimuth scale in the observation field of view, however in such a way that this second image also has the same optical quality as the image of the crosshair. However, this latter condition cannot be met by simply looking for a Azimuth scale with the beam path to be arranged based on the example of a well-known panorama sextant of the same bundling system that is intended for the crosshair. Requirement for the The desired optical quality of the reflected azimuth scale is, this azimuth scale is just as bright to illuminate like the crosshairs and then to take precautions that the optical light path of the Scale display with regard to possible light-weakening elements as identical as possible to the light path the crosshair is displayed.

However, this prerequisite is the one mentioned at the beginning for a periscope sextant The construction cannot be realized without further ado, because the existing semi-transparent mirror is a light attenuating one Element works. If you want the same mirror for the reflection of the azimuth scale use, this is not immediately possible because it is under the mirror in the light path the crosshair reflection of the pendulum mirror is located, through which the light path of the scale reflection must not run.

The task set, the known additional reflection of an azimuth scale in the observation field of view to improve, is achieved according to the invention by the following features:

a) The optical axis of the crosshair illumination consisting of the light source and condenser is offset together with the crosshairs to the side against the Einspiegelungsweg, and to the A deflection prism is used to deflect the crosshair imaging beam into the reflection path intended;

b) the azimuth scale is illuminated by the same light source via a second condenser;

c) for imaging the azimuth scale in the focal plane of the eyepiece, a converging lens is pre-periscope sextant

Applicant:

Kollsman Instrument Corporation,

Elmhurst, N. Y. (V. St. A.)

Representative:

Dipl.-Ing. C. Wallach, patent attorney,

Munich 2, Kaufinger Str. 8

Named as inventor:
Ervin Douglas Mac Donald,
East Williston, NY (V. St. A.)

Claimed priority:

V. St. v. America July 14, 1960 (92 940)

see whose optical axis through the scale reference point and parallel to the reflection path, but laterally offset from this;

d) between the converging lens and the deflecting prism is a path coaxial with the reflection path Lens system arranged through which due to the lateral offset of the converging lens axis the scale imaging beam is angled in relation to the reflection path The beam continues, which laterally passes the deflecting prism, but still hits the semi-transparent mirror;

e) to reflect the angled mirror that has passed through the semi-transparent mirror Scale imaging beam below that for reflecting into the observation field of view An auxiliary mirror fixed to the housing is provided for the required angle.

An embodiment of the invention is described below with reference to the drawing. In the Drawing shows

1 shows an external view of the periscope sextant according to the invention,

F i g. 2 shows a vertical section of the periscope sextant according to FIG. 1,

F i g. 3 shows a schematic representation of the beam path of the periscope sextant according to FIG. 1 and 2.

The periscope sextant, designated as a whole by the reference number 10, is held by a holder 11 carried. Its azimuth scale 12 is from a

609 668/120

Computing device 56 set. The azimuth scale 12 and the vertical tube 15 of the sextant 10 have the same vertical axis of rotation so that the crosshair line in the eyepiece can be used as an index line, against which the true azimuth of an observed object can be read. This rotation around a common Axis also makes it possible to use the periscope sextant as an astro compass.

The light emanating from a celestial body 16 is through a window 17 at the top of the periscope tube 15 and an index prism 18 rotatable about its horizontal axis through objective lenses 25 and 26 as well as an objective field lens 27 and an erecting system comprising the lenses 28 and 29 directed at a prism 31 and deflected by this horizontally towards the eyepiece 30 A real image of the celestial body 16 is generated in the focal plane of the inversion system.

A crosshair 65, which is illuminated by a light source 36, is arranged outside the sextant tube 15 within a condenser lens system 35. On the side of the light source 36 opposite the lens system 35 lie a second condenser lens system 40 and a deflecting prism 41 which directs the light beam a emanating from the light source 36 onto the azimuth scale 12 for the purpose of illuminating the same.

In the following, with reference to FIG. 3 the beam path of the periscope sextant according to the invention described:

The image of the celestial body 16 is directed along the beam s via the objective lens 26 and the field lens 27 and the erecting lenses 28 and 29 to the 90 ° prism 31. The beam deflected by the prism 31 passes through the semipermeable mirror 45 and is imaged in the focal plane of the lens 34. The real image of the celestial body generated in this way is then fed to the eyepiece via lenses 32 and 33 (beam s).

The light source 36 illuminates the crosshairs 65 via the condenser 35, and the crosshair imaging beam / is deflected via a deflecting prism 42 into the reflection path b. The optical axis of the arrangement consisting of condenser 40, light source 36 and condenser 35 is laterally offset to the reflection path b. The image of the crosshairs takes place via the reflection path b, through the semipermeable mirror 45, then further in the beam r via the lens 44 and the pendulum mirror 43, from which the beam is reflected, the returning beam finally via the semipermeable mirror 45 after the Eyepiece is too deflected.

The light source 36 illuminates through the second condenser 40 and the deflection prism (α beam) 41 and the azimuth scale 12, the converging lens is used to image the azimuth scale 12 in the focal plane of the eyepiece 46 whose optical axis c by the scale reference point, and b parallel to Einspiegelungsweg, but laterally offset from this. Between the converging lens 46 and the deflecting prism 42 there is a lens system 47 which is coaxial with the mirroring path b and through which, as a result of the lateral displacement of the converging lens axis c by the amount Δ of the scale image

transmission beam c 'continues in a beam d which is angled in relation to the reflection path b , which runs laterally past the deflecting prism 42 and hits an auxiliary mirror 49 fixed to the housing through the semi-transparent mirror 45. This auxiliary mirror 49 reflects the beam via e onto the semipermeable mirror and from there to the eyepiece. The image A of the azimuth scale 12 accordingly coincides in the eyepiece 30 with the image of the star 16 (ray s) and with the image of the crosshair 65 (ray r) , the images of the azimuth scale 12 and the crosshair 65 because of the optical equivalence the light paths are of the same quality.

Claims (1)

Claim: Periscope sextant, in which the image of a crosshair over a semi-transparent mirror and a pendulum mirror is reflected in the observation field of view, wherein the crosshair is illuminated by a light source via a condenser, characterized by the following features for the known per se additional reflection of an azimuth scale in the observation field of view: a) The optical axis of the crosshair illumination, consisting of the light source (36) and condenser (35), is offset together with the crosshair (65) laterally against the reflection path (b) , and to deflect the crosshair imaging beam (/) into the reflection path (b) ) a deviating prism (42) is provided; b) the azimuth scale (12) is illuminated by the same light source (36) a second condenser (40); c) for imaging the azimuth scale (12) in the focal plane of the eyepiece, a converging lens (46) is provided, the optical axis (c) of which runs through the scale reference point and parallel to the reflection path (b), but laterally offset with respect to this; d) between the converging lens (46) and the deflecting prism (42) is arranged a lens system (47) which is coaxial with the mirroring path (b) and through which, due to the lateral displacement of the converging lens axis (c), the scale imaging beam (c ') is integrated continues beam (d) which is angled in relation to the reflection path (6) and which runs laterally past the deflecting prism (42), but still strikes the semi-transparent mirror (45); e) an auxiliary mirror (49) fixed to the housing is provided for rear-reflecting the angled scale imaging beam (d) that has passed through the semi-transparent mirror (45) at the angle required for reflecting into the field of view. Considered publications:
U.S. Patents Nos. 2,266,741, 2,579,903,
894 330. 1 sheet of drawings 609 668/120 9.66 © Bundesdruckerei Berlin