WO1997040413A2 - Nachtsichtvorrichtung - Google Patents
Nachtsichtvorrichtung Download PDFInfo
- Publication number
- WO1997040413A2 WO1997040413A2 PCT/EP1997/002105 EP9702105W WO9740413A2 WO 1997040413 A2 WO1997040413 A2 WO 1997040413A2 EP 9702105 W EP9702105 W EP 9702105W WO 9740413 A2 WO9740413 A2 WO 9740413A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- night vision
- vision device
- light
- liquid crystal
- sensor
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
- G02B23/125—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification head-mounted
Definitions
- the invention relates to a night vision device, in particular darkroom glasses, with at least one light source that preferably emits light with a wavelength of 850 to 950 nm, at least one image sensor and at least one image sensor, wherein the image sensor and the image sensor are preferably arranged in a housing and the image sensor is from the image sensor converts recorded light beams into visible light beams and emits them to at least one optical system for a viewer, and an energy source, preferably an accumulator, is provided for operating at least the image converter.
- Such night vision devices are known from the prior art. These night vision devices are used in particular in photo-technical laboratories or the like to remedy system faults or defects in large-scale development devices for negative films or the like on site. It is important here that the photographic material is not exposed to light of a wavelength which leads to an exposure of the photographic material. It has been found that light with a wavelength of more than 750 nm is harmless to the photo material to be developed, namely the negative films, so that light sources can be used which emit such light.
- darkroom glasses are available on the market, which are night vision devices of the generic type, which use an image converter tube as an image converter, which is an electron-optical device which transmits the invisible, emitted objects.
- z. B. converts infrared light rays into visible ones. The light rays hit a photo cathode; the electrons released in this way are made visible on a fluorescent screen which is part of the image converter tube.
- high voltages are necessary.
- Such high voltages cannot be provided with accumulators available on the market, but such accumulators are necessary in order to make such darkroom glasses sufficiently flexible, ie to make them usable at any point.
- the darkroom glasses described above have a high-voltage part, which transforms the voltage removed from the batteries to the necessary high voltage.
- this has the disadvantage that conventional accumulators only allow a very short working time with these darkroom glasses. An extension of the working time is only possible if larger accumulators are used which, however, are very heavy, so that they have been handled separately from the darkroom glasses, for example they have to be attached to a belt of the observer wearing the darkroom glasses.
- the darkroom glasses described above have the disadvantage that the image converter tubes used have a large overall length in the axial direction, so that the correspondingly designed darkroom glasses, based on the viewer's face, have a correspondingly excellent overall length that does the work difficult with such darkroom glasses.
- darkroom glasses of this type are designed in accordance with binoculars, so that the distance between the eyes can also be adjusted by pivoting the two lenses around the central axis. It follows from the preceding descriptions that a further disadvantage of the previous Known night vision devices consist in the fact that the use of correspondingly large accumulators or the large overall length of the night vision devices means that heavy weight is to be handled.
- the invention is based on the object of creating a generic night vision device which can be used in particular when working in photo laboratories or the like, the night vision device having a compact design and in particular with low energy, namely without High voltage, can be operated.
- the solution to this problem provides that the image sensor is designed as a silicon crystal sensor and the image converter is designed as a liquid crystal monitor, which are connected to one another.
- Such a night vision device has the particular advantage that image recorders and image transducers are designed as flat components, so that overall a night vision device with a small axial length is possible.
- both the silicon crystal sensor and the liquid crystal monitor can be operated with only low voltages and currents, so that overall a positive energy balance can be achieved, which makes it possible to operate a night vision device according to the invention with low electrical energy, which may necessary batteries can be used according to smaller dimensions. It is thus possible, for example, to integrate such accumulators in the area of the night vision device without significantly increasing the weight of this night vision device compared to the prior art.
- the invention Night vision device has the advantage that the image sensor and the image converter do not necessarily have to be arranged one behind the other in the axial direction, since only an electrical connection has to be made between the image sensor and the image converter which is suitable for transmitting the information from the image sensor to the image sensor which then converts the information and delivers it to the viewer via an optical system. Accordingly, for example, only the image sensor and the optical system can be arranged in the region of the field of view of the viewer, whereas the image converter can be arranged above the components mentioned above, but also laterally to the field of view of the viewer. Ultimately, it is only of interest that the information provided by the image converter is fed to the optical system which makes the information visible to the viewer.
- the liquid crystal monitor is designed as a flat monitor, preferably using a black and white or monochrome monitor.
- the flat monitor has the particular advantage here that its overall length arranged in the axial direction of the night vision device is very small.
- the use of a monochrome monitor is advantageous since it provides the viewer with a high-contrast and eye-friendly image. It has also proven to be advantageous to use as the liquid crystal monitor a backlit monitor which emits a clearly recognizable image into the optical system, which the observer can recognize without any problems.
- the optical system consists of at least two lenses and at least one mirror and / or prism with which the liquid crystal mono- emitted light beams can be projected into the lenses.
- the image recorded by the image sensor can be projected into both eyes of the viewer with only one image sensor and one image converter.
- the viewer's second eye only looks at the object with a combination of an eyepiece and a lens. No light amplification takes place here.
- each silicon crystal sensor is preceded by a lens with which, for example, it is possible to focus the recorded image.
- the object is focused on the image sensor through the lens.
- the focusing according to a further feature of the invention can be carried out by changing the distance between the lenses and the liquid crystal monitor. As a result, the image of the image converter is focused for the viewer.
- the optical system has two lenses, each of which is assigned a silicon crystal sensor and a liquid crystal monitor. Accordingly, an image recorder and an image converter are provided for each eye of the viewer, the image recorder being designed as a silicon crystal sensor and the image converter being designed as a liquid crystal monitor, and each combination of image recorder and image converter provides the information separate optical system, namely a lens, which is arranged in front of the corresponding eye of the viewer.
- the two image recorders and / or the image converters are each in one plane, the optical system being movable relative to this plane by the information transmitted by the image converter to the viewer, namely the images, on the visual behavior to be able to adjust the viewer, namely to focus.
- a further setting possibility is given in that at least one lens can be adjusted relative to the plane of the image sensor and to at least one further lens, so that the observer's ametropia and eye defects can be compensated.
- two light sources are arranged next to a silicon crystal sensor. These are light sources that emit light with a wavelength of over 750 nm, preferably 850 nm. Light with a wavelength of up to 600 nm is visible to the human eye, so that the night vision device described above can also be used for other uses. For example, night vision devices of this type can also be used for surveillance in the military or police field. In addition, such night vision devices can be used for working with light-sensitive materials, for example in industrial applications.
- the light sources described above namely the infrared light sources, can also be handled independently of the night vision device, ie they can be arranged externally. As a result, the weight of the night vision device is further reduced and these light sources can be supplied with a separate accumulator with electrical energy, so that the accumulator can be further reduced in the night vision device.
- the light sources can be mounted as a unit on the housing or can be removed therefrom, so that the night vision device can be designed for different possible uses.
- the objective of each silicon crystal sensor is designed as an easily exchangeable component. This also allows the optics to be adapted to different tasks.
- Light-emitting diodes are preferably used as light sources, which emit light waves either constantly or intermittently in the area not visible to the human eye.
- GaAlAs light-emitting diodes have proven to be particularly advantageous, their efficiency is 60% at a wavelength of the emitted light of 935 nm.
- Light-emitting diodes of the type GaAs have proven to be advantageous for working with light-sensitive materials, for example photographic materials. These GaAs light-emitting diodes achieve an efficiency of 90% with an emitted light wavelength of 890 nm.
- the lens in front of the silicon crystal sensor is preferably controlled via a video signal which is recorded by the silicon crystal sensor and evaluated to control the lens aperture.
- a video signal which is recorded by the silicon crystal sensor and evaluated to control the lens aperture.
- the silicon crystal sensor controls the diaphragm, which then opens. If the intensity of the video signal increases, the aperture of the lens is reduced.
- each silicon crystal sensor with the lens is a shutter Forms camera that can be controlled by a change in the reading frequency of the sensor controlled by a video signal.
- moving images can be recorded with a high speed shutter and converted into a relatively flicker-free and continuous video image.
- still images can be recorded with a low speed shutter, the reading frequency of the silicon crystal sensor being able to be reduced.
- the aperture of the lens can be enlarged, as a result of which a larger amount of light strikes the sensor, the processing of which causes a lower energy requirement.
- Light-emitting diodes of the above-mentioned design usually produce light flashes in the nsec range. In order to record these flashes of light, the reading frequency of the silicon crystal sensor is changed, but this is associated with a large expenditure of energy. In order to avoid this disadvantage, it is proposed according to the invention to control the flash frequency of the light-emitting diodes via the video signal recorded by the silicon crystal sensor. This video signal represents the amount of light present, so that the flash frequency of the diodes is increased if the video signal is too weak. Conversely, the flash frequency is reduced when the video signal indicates a sufficient amount of light. In this way, as much energy is consumed as is required by the lighting conditions caused by the use.
- a switch can be used to choose between a continuous emission and a flashing emission, ie an interrupted emission of the light-emitting diodes.
- the LEDs When the light is low, the LEDs are switched to the permanent emission position.
- the energy-saving circuit shown above is switched on when the light intensity is high, this circuit relating to the recording of a still image.
- the light emission of the light-emitting diodes takes place with a video signal-controlled infrared switching frequency and a fixed reading frequency of the silicon crystal sensor. Accordingly, the energy-saving circuit of the light-emitting diodes described above is used in the case of moving images.
- the housing has a headband with which the housing can be attached to the head of the viewer, so that both hands of the viewer are free for the work to be carried out.
- Figure 1 is a schematic representation of a first
- Embodiment of a night vision device Embodiment of a night vision device
- FIG. 1 a shows a schematic illustration of a second embodiment of a night vision device in side view
- Figure 2 is a schematic representation of a third embodiment of the night vision device.
- Figure 3 is a circuit diagram of a video signal controlled lamp current control.
- a liquid crystal monitor 2 is arranged in a housing 1, the screen surface 3 of which faces an optical system 4.
- the optical system 4 consists of a prism 5, the cathets of which face the screen surface 3 of the liquid crystal monitor 2 are. Furthermore, the optical system 4 has mirrors 6 aligned parallel to the cathets of the prism 5 and two lenses 7 designed as eyepieces.
- the liquid crystal monitor 2 is electrically connected via connecting lines 8 to an image sensor embodied as a silicon crystal sensor 9.
- a lens 10 is connected upstream of the silicon crystal sensor 9.
- two light sources 11 are arranged, which emit light with a wavelength of more than 600 nm, preferably 950 nm. This light is imperceptible to the human eye.
- the housing 1 has two openings 12 arranged in the region of the lenses 7, the spacing of which, together with the lenses 7, can be adjusted to the pupil distance of the viewer.
- the distance between the liquid crystal monitor 2 and the lenses 7 can be varied, so that focusing can be carried out by changing this distance.
- a further adjustment is carried out by changing the distance from a lens 7 to the liquid crystal monitor 2 and to the second lens 7, which compensates for eye disagreements of the viewer.
- the above-mentioned night vision device 13 is designed as a device to be attached to the head of the viewer and accordingly has a headband 14 of variable length and a central belt 15 at its end having the lenses 7.
- This night vision device 13 can be used, for example, to carry out work in large-scale development work. directions for photographic material possible without the existing photographic material being exposed to light in these devices, which causes a change, namely an exposure of this photographic material.
- the dark room is illuminated with the light sources 11, so that the reflected light beams can be fed to the silicon crystal sensor 9 via the objective 10.
- the silicon crystal sensor 9 converts the optical information into digital information which is fed via the connecting lines 8 to the liquid crystal monitor 2, which converts this digital information into optical information on its screen surface 3 and at the same time amplifies the optical information.
- This optical information is projected from the screen surface 3 onto the prism 5, namely onto its catheter, from where the optical information via the mirrors 6 is projected into the lenses 7, so that a viewer carrying the night vision device 13 receives the information recorded by the silicon crystal sensor 9 in the form of amplified optical information.
- FIG. 1 a shows an alternative embodiment of the night vision device, in which the surface normals of the silicon crystal sensor 9 and the liquid crystal monitor 2 run essentially at right angles to one another.
- the light beams or image information emitted by the screen surface 3 of the liquid crystal monitor 2 are deflected by the mirror 6 essentially at a right angle in the direction of the lens 7. It follows from this that the surface normal of the mirror 6 extends at an angle of 45 ° to the surface normal of the silicon crystal sensor 9 and the liquid crystal monitor 2.
- the above-described embodiment of the night vision device 13 has the advantage that the three essential components, namely the silicon crystal sensor 9, the liquid crystal monitor 2 and the optical system 4 are not arranged one behind the other in a linear manner, but are offset from one another, so that with this arrangement one Night vision device 13 is created with a very small length.
- the embodiment of the night vision device 13 shown in FIG. 2 differs from the night vision device shown in FIG. 1 in that a liquid crystal monitor 2, a silicon crystal sensor 9 and a lens 10 are provided for each lens 7, so that the lens shown in FIG 2 illustrated embodiment of the night vision device 13, three-dimensional vision of the objects viewed in the dark room is possible. Accordingly, in the night vision device 13 shown in FIG. 2, a simpler optical system 4 can be used, which does not require a prism 5 and mirror 6.
- the embodiments of the night vision device 13 shown in FIGS. 1, 1 a and 2 can also be modified such that the light sources 11 are arranged externally of the housing 1.
- the illustration of an accumulator necessary for the operation of the night vision device 13 has been dispensed with.
- Such an accumulator is designed in a manner known per se and can either be integrated into the housing 1 or attached externally, for example on a belt of the viewer, in which case an energy line is provided between the night vision device 13 and the externally arranged accumulator.
- a video signal-controlled lamp current control is shown in the circuit diagram in FIG.
- the circuit diagram shown in FIG. 3 has a connection 20 to a direct current source.
- An input 21 is arranged on the output side, via which a video signal, which is recorded and converted via the lens 10, is input into the circuit.
- the resistor 28 is connected on the one hand to the line 23 and on the other hand to the emitter of an NPN transistor 29.
- the transistor 29 has its collector connected to a line 30 which connects the collector of the transistor 29 to the line 22.
- a large number of infrared diodes 31, for example of the type LD271, which responds to a wavelength of 950 nm, are arranged in line 30, the number of infrared diodes 31 being dependent on the operating voltage.
- the base of the transistor 29 is connected via a line 32 to the resistor 27 and the collectors of two NPN transistors 33 and 34, the transistors 33 and 34 being connected to the line 23 on the emitter side.
- the transistor 34 has its base connected to a resistor 35 which is connected at its opposite end to a line 36 which connects the emitter of the transistor 29 to the resistor 28, which in turn is connected to the line 23.
- the transistor 33 has its base connected to a resistor 37, which on the other hand is connected to a line 38 in which a resistor 39, a diode 40 and a capacitor 41 are connected in series, with the resistance 37 between the resistance 39 and the capacitance 41 is connected and the positive plate of the capacitance 41 is opposite the resistor 39.
- the capacitance 41 is connected to the line 23 with its negative plate.
- the resistor 26 is connected on the one hand to the line 22 and on the other hand to the collector of an NPN transistor 42, the diode 40 also being connected to the collector of the transistor 42.
- the emitter of transistor 42 is connected to line 23.
- a further resistor 43 is connected, which connects the base of the transistor 42 to the collector of a transistor 44, to which the resistor 25 is also connected, which on the other hand is connected to the line 22 .
- the transistor 44 is also connected to the line 23 on the emitter side and has on its base a resistor 45 which is connected to the negative plate of a capacitance 46 which is connected with its positive plate to the input 21 of the video signal.
- the resistor 45 and the capacitor 46 are arranged in a line 47, to which a line 48 is connected between the capacitor 46 and the resistor 45, which on the one hand has a diode 49 and on the other hand a resistor 50 connected in series with the diode 49
- the line 47 is connected between the diode 49 and the resistor 50 to the line 48.
- the diode 49 is connected via a line 51 to a line 52 in which the resistor 24 is connected in series with a further diode 53.
- Line 52 connects line 22 to line 23, line 51 being connected to line 52 between resistor 24 and diode 53.
- the line 48 is connected on the output side of the resistor 50, ie on the side of the resistor 50 facing away from the diode 49, to the line 23.
- the resistors 26 and 27 preferably have a size of 22 k ⁇ .
- the resistor 25 is preferably 8.2 k ⁇ .
- Resistors 43 and 45 each have a size of 15 k ⁇ .
- the resistor 24 is preferably 4.7 k ⁇ , whereas the resistor 50 has a value of 5.6 k ⁇ .
- the resistor 39 has a size of 100 k ⁇ .
- the resistor 37 has a size of 82 k ⁇ .
- Resistor 35 has a size of 1 k ⁇ and resistor 28 has a size of 4.7 k ⁇ for a current limitation of 100 mA.
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eye Examination Apparatus (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19616319.6 | 1996-04-24 | ||
DE19616319 | 1996-04-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997040413A2 true WO1997040413A2 (de) | 1997-10-30 |
WO1997040413A3 WO1997040413A3 (de) | 1997-12-04 |
Family
ID=7792277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/002105 WO1997040413A2 (de) | 1996-04-24 | 1997-04-24 | Nachtsichtvorrichtung |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO1997040413A2 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9729767B2 (en) | 2013-03-22 | 2017-08-08 | Seiko Epson Corporation | Infrared video display eyewear |
WO2019180280A1 (es) * | 2018-03-19 | 2019-09-26 | Procarelight, S.L. | Dispositivo de protección ocular contra rayos láser |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781560A (en) * | 1972-06-07 | 1973-12-25 | Raymond J Deburgh | Night viewing system for reading without light |
EP0691559A1 (de) * | 1994-07-07 | 1996-01-10 | Gec-Marconi Limited | Auf dem Kopf tragbares Anzeigsystem |
DE9418695U1 (de) * | 1994-11-22 | 1996-03-21 | Brugger, Gerhard, 83700 Rottach-Egern | Nachtsichtvorrichtung |
DE4441550C1 (de) * | 1994-11-22 | 1996-07-18 | Gerhard Brugger | Nachtsichtvorrichtung |
-
1997
- 1997-04-24 WO PCT/EP1997/002105 patent/WO1997040413A2/de active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781560A (en) * | 1972-06-07 | 1973-12-25 | Raymond J Deburgh | Night viewing system for reading without light |
EP0691559A1 (de) * | 1994-07-07 | 1996-01-10 | Gec-Marconi Limited | Auf dem Kopf tragbares Anzeigsystem |
DE9418695U1 (de) * | 1994-11-22 | 1996-03-21 | Brugger, Gerhard, 83700 Rottach-Egern | Nachtsichtvorrichtung |
DE4441550C1 (de) * | 1994-11-22 | 1996-07-18 | Gerhard Brugger | Nachtsichtvorrichtung |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9729767B2 (en) | 2013-03-22 | 2017-08-08 | Seiko Epson Corporation | Infrared video display eyewear |
US10218884B2 (en) | 2013-03-22 | 2019-02-26 | Seiko Epson Corporation | Infrared video display eyewear |
WO2019180280A1 (es) * | 2018-03-19 | 2019-09-26 | Procarelight, S.L. | Dispositivo de protección ocular contra rayos láser |
Also Published As
Publication number | Publication date |
---|---|
WO1997040413A3 (de) | 1997-12-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0923752B1 (de) | Kompaktes video-mikroskop | |
DE69429872T2 (de) | Monokulare nachtsichtvorrichtung | |
DE69226416T2 (de) | Transportabler Kommunikationsempfänger mit miniaturisierter virtueller Bildanzeige | |
DE19809727C2 (de) | Endoskopsystem mit Fluoreszenzlicht | |
DE3137892C2 (de) | ||
DE1572757A1 (de) | Nachtfernrohr mit Infrarotzusatzeinrichtung | |
EP1535101B1 (de) | Kamera-Adapter für ein Mikroskop | |
EP1074214A1 (de) | Gerät zur Augenuntersuchung mit einer Scheimpflugkamera und einem Spaltprojektor | |
EP1570682A1 (de) | Helligkeits- und farbregelung eines projektionsapparates | |
EP1126299A1 (de) | Gerät mit Nachtsichtfähigkeit | |
DE2145959C3 (de) | Strahlungsempfänger | |
DE102017107178A1 (de) | Vorrichtung zum Erzeugen von reflexkorrigierten Abbildungen, Mikroskop und Reflexkorrekturverfahren zum Korrigieren von digitalen mikroskopischen Abbildungen | |
DE2948687A1 (de) | Binokulare betrachtungsanordnung | |
DE3446727A1 (de) | Autofokuseinrichtung fuer mikroskope | |
DE19517476B4 (de) | Photomikroskop | |
DE3242716C2 (de) | Optisches Bildbeobachtungsgerät | |
EP0651225B1 (de) | Visiereinrichtung | |
DE4441550C1 (de) | Nachtsichtvorrichtung | |
WO1997040413A2 (de) | Nachtsichtvorrichtung | |
US6326604B1 (en) | Optical intensification system, including an image intensifier, for viewing an input source through a lens as a virtual image or as a real image | |
DE2041237C3 (de) | Automatische Scha rf einstellvorrichtung für Kameras oder dergleichen | |
DE9418695U1 (de) | Nachtsichtvorrichtung | |
DE10122935B4 (de) | Vermessungsinstrument mit optischem Entfernungsmesser | |
DE19901963A1 (de) | Stereomikroskop | |
DE4412100C2 (de) | Anordnung zur Messung der Entfernung eines Objektes und dessen Abbildung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): CA CN JP KR RU US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
AK | Designated states |
Kind code of ref document: A3 Designated state(s): CA CN JP KR RU US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: JP Ref document number: 97537755 Format of ref document f/p: F |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
122 | Ep: pct application non-entry in european phase |