DD220113A1 - ARRANGEMENT FOR LIGHT INTENSITY CONTROL, PREFERABLY FOR ELECTROOPTICAL DISTANCE KNIVES - Google Patents

Abstract

The invention relates to an arrangement for Lichtintensitaetsregelung, preferably for electro-optical rangefinder, which include a Sendeempfaengeranordnung for emitting and receiving an optical beam beam via a geraeteinterne Vergleichsstrecke and a long distance, and means for switching and controlling the Lichtintensitaet. The aim is to increase the reliability of the light intensity control and switching system, to save optical and mechanical components and to reduce assembly costs. This is achieved by providing a circular aperture in the transmitter / receiver beam path, rotatable about the optical axis of the objective, such that a first (1) and second (2) annular zone are diametrically opposite each other, completely translucent, that a third (3) and fourth (4) diametrically opposed annular zone are each divided into two concentric regions, wherein the inner region (5) of the third annular zone (3) and the outer region (6) of the fourth annular zone (4) are opaque and that the outer region (7) the third circular ring zone (3) has a steadily increasing light transmission and the inner region (8) of the fourth circular ring zone (4) is completely translucent. Fig. 1

Description

Title of the invention;

Arrangement for controlling the light intensity, preferably for electro-optical rangefinders

Field of application of the invention; ·

The invention relates to an arrangement for control and

Circuit of the light intensity in the send Empfängerstrahlen- ^l gang an electro-optical rangefinder, but it is also widely applicable where multiple beam paths Lichtintensitätsregel- and retains processes forward 'X 10 are taken. ^.

Characteristics of the known technical solutions: ^ lektrooptic rangefinder send, an infrared,

• after certain frequencies intensity-measured measuring beam, from and receive it again after reflection on a triple prism, because it is at a target point to be measured. * * ^N ; det. The back-reflected light is very weak. The electro-optical range finders therefore have a device-internal comparison section (short-circuit path), by which the received light is compared with the transmitted light over the long distance to eliminate errors in the frequency measurement. The short circuit path. is thereby of the type of construction of the transceiver optics unü, de. careful separation of the sent, and ';; received optical radiation dependent. <' ^: ' Distance meta-systems that provide a short-circuit path ¹

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are described in CH-PS 606 991 and: • US Patent 4,113,381. To realize the short-circuiting distance use the known electro-optical

Rangefinder depending on the nature of the transceiver arrangement more or less optical. Components before or after the lens, or a second optical imaging system with additional apertures for beam splitting between the short circuit path and the long distance, Ss is known, mechanical diaphragms, against each other displaceable or rotatable grids, G-wedge or mutually rotatable polarizers for light int ens it's Weakening to use. From DD-PS 222 912.1 is a: - disc-shaped aperture to attenuate the light intensity '/ ""; '; an optical Strahienganges known, with a in the

·. ·. .. 15 substantially parallel to the circumference of the aperture running, '.': Tapered opening »Using two themselves

each extending over 180 ° openings can by Zu- '. ·. Order a filter to one of the two openings of ''. Weakening of light intensity be increased. ', 20, this arrangement of a disc-shaped diaphragm has the Hach''\ te.il that the light intensity is only weakened, a .'- circuit and control the optical path not ^vS is possible. The use of mechanical diaphragms has the

That · they need disadvantage mechanical arrangements for moving the individual diaphragm parts that an accurate 'light intensity attenuation over a longer loading: rich non-guarantee ^first

· When using liquid crystals tensitätssch to-Lichtin-} - '/ ächung they must be heated in cold weather, what special arrangements-demand. .

Object of the invention :

By 'invention, the aforementioned shortcomings are to be eliminated, the electromechanical ^ and optical complexity on ι components reduced' and the reliability of the overall system to influence the light intensity can be increased.

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Explanation of the essence of the invention:

The invention has for its object to provide an arrangement for Lichtintensitätsregelung- and circuit for an electro-optical rangefinder · According to the invention, this object is achieved in that an annular aperture in the transmitting and receiving beam path rotatably provided about the optical axis of the. Lens in that a first (1) and a second (2) annular zone are diametrically opposed, fully

10, are constantly translucent, that a third (3) and a fourth (4) diametrically opposed annular zones are each divided into two concentric regions ι, wherein the inner region (5) of the third annular region (3) and the outer region (6 ) of the fourth annular zone (4) are opaque and that the outer region (7) of the third annular zone (3) has a steadily increasing Lichtdurchiässigkeit and the inner region (8) of the fourth annular zone (4) is completely transparent. The aperture for light intensity control is advantageous to arrange on a glass ring ·. '' By the invention it is possible to save optical and mechanical components, thus one obtains a lower assembly cost and the reliability of the overall system of Lichtintensitätsregelung- and circuit is increased; Furthermore, eliminates the illumination of the receiver ' diode in reflected light, the adjustment of the selective mirror.

Embodiment:. ^! ·

The invention will be explained in more detail below with reference to the schematic drawings. Show it:

Figure 1 shows the aperture ring according to the invention for Lichtintensitätsregelung- and circuit

2 shows a transceiver arrangement Qines'elektrooptischen rangefinder.

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., ^: . . , · .- · · ^; '- 4 -; '.

Figure 1 shows the arrangement of the circular aperture 16, consisting of the four (1 to 4) annular zones. A first ... and a second 2 circular ring zone are completely translucent and lie on each other in the axis

-5 X ^ -X ₁ diametrically opposite · A third 3 and fourth 4 circular ring zone are each divided into two concentric areas, an inner area 5 of the third annular zone 3 and an outer portion 6 of the

/ fourth annulus zone 4 is opaque and an outer region 7 of the third annulus zone 3 has a ste / ög rising light transmittance, and an inner region 8 of the fourth annulus zone 4 is completely · light-> permeable. In one axis y .. - yy, are'for the circle. ringzorien 3. and "4 half-pupils for a short-distance section 2.8 and a long-distance section 27. One half-pupil 9 for the long-distance track 27, a half-pupil

  "10 for the short circuit section 28 for the third circular 'ring zone 3 and a half-pupil 11 for the Pernstrekke 27 and a half-pupil 12 for the Kurzschlußstrekke .28, .für the fourth annulus zone 4 ..

, The operation of the annular aperture 16 and their arrangement in the transceiver system of a, elsktroopti-. see rangefinder is explained in more detail in Figure 2,. . ' In Figure 2, a biaxial optical transceiver array with diametrically-arranged transmitter 13 and receiver 14 is shown. That of the transmitter 13: au'sge-. transmitted infrared light beam is directed parallel by a lens 15 and strikes the circular aperture 16. Is the light beam

Then sent over a long distance 27 on a reflector, not shown, in a target point to be measured, then acts on the passage through the annular aperture 16, the controllable gray wedge aperture 7 and the half-pupil 9 is translucent. The other half

.35 pupil 10 works through the applied 31ende 5 light-

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impermeable. The light beam is then transmitted via a prism 17 to a beam splitter 18 with the sheet 19 and from there to a lens. 20 with a diverging lens 21 on a selective mirror, 22 off. formed and further radiated by daä objective 20 on the reflector, not shown in the target point. The light beam reflected back from the reflector then enters through a cover plate 23 which carries the beam splitter back into the lens 20 on the other side and is collected by the latter and via the selective mirror 22,. the lens 20 to a pentaprism 24, through the annular aperture 16 and a lens in the receiver 14 shown.

, - ,. The half pupil 9 passes through the outer part of the gray-wedge diaphragm 7 when passing through the gray-wedge diaphragm 7 of the third 15-ring zone 3. The gray-key diaphragm 7 is then rotated by a drive 29 until the desired light intensity is adjusted. It is then adjusted to the short-circuit path (device-internal comparison section) 28. The circular diaphragm i6 'and the gray-wedge diaphragm 7 are then rotated by the drive 29 by 180 ° so that the translucent diaphragm 8 and the gray-wedge diaphragm 7 are arranged in front of the transmission objective 13. The infra red light beam emitted by the transmitter 13 is collimated by the objective 15. When passing through the grayscale diaphragm of the third circular ring zone 3, the half pupil 12 becomes . ., .. · through the opaque diaphragm layer. 6 of the fourth annular zone 4 opaque. The half-pupil-Ie 9 7 / ird through the gray-wedge diaphragm. 7 and adjusted by the drive 23 to the desired light intensity. The adjusted light intensity of the half-pupil 9 is then transmitted through the prism 17 through the pentaprism 24, through the translucent segment of the gray-frilled diaphragm and through the lens 26 to the receiver. 14 shown.

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At the same time, the drive 29 thus regulates the intensity of the long-distance path 27 by turning the circular-ring-shaped diaphragm 16, and at the same time switches off the short-circuit.

, Final section 28 off. The transmission pupil is open. The same drive 29 rotates the annular aperture, 16 umd 180 °, thus opens the short-circuit line 28, ··, .. closes the. Long distance 27 and also controls the intensity of the short-circuit path 28 to the intensity of the long-haul 27 and vice versa. 'Turns the drive 29, the annular aperture to SO ⁰ , opens'er so that

Transmitter pupil and illuminated via the short-circuit path, the receiver surface 14, - so that it is visible for the adjustment and together with the transmitting diode 13 in a C ':'' collimator, not shown, can be considered So if the half-pupil 12 of the short-circuiting section 28 dimmed controls the region 7 of the third annulus zone 3 is the long-distance pupil 9 of the long-distance route, the region 5 of the third annulus zone 3 being the same length as the region 7 ' the half-pupil 10 of the short-circuiting path 28 is dimmed in front of the receiver 14. The pentaprism 24 then effects the corresponding cancellation of the short-circuiting path light, so that a double dimming is ensured.

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Claims (2)

Erf indungsans pruch:. 1. An arrangement for light intensity control, preferably for electro-optical «rangefinder, with a transceiver device, for emitting and receiving an optical beam via a device internal short circuit and a long distance to a reflector, which is arranged in a target to be measured by the transmitter-receiver beam paths partially run parallel to the optical axis of the lens and means for controlling and switching the (Light intensity, characterized in that a Circular aperture in the transceiver beam path is rotatable about the optical axis of the objective lens, such that a first (V) and second (2) circular ring zone are diametrically opposite one another, completely translucent, that a third (3) and fourth (4 diametrically opposed annular zone each, because in z / ei concentric areas are divided, the inner. Area (5) of the third annular zone (3) and the outer region (6) of the fourth circular zone (4) - are opaque and that the outer region (7) of the third. Annular ring zone (3) has a steadily increasing light transmission and the inner ^v - ^! Area (8) of the fourth annular zone (4) completely is translucent. 2. Arrangement according to item 1, characterized in that the diaphragm preferably on a. Glass ring is arranged. For this 1 sheet drawings La / Pch WG / 4340