A field glass with display of additional information

Abstract: A field glass (e.g. monocular, binoculars, aiming telescope) having means for alternatively observing additional information, an information carrier or an information deflecting means being disposed in the beam path, the information carrier or information deflecting means being disposed within the housing of the field glass and adapted to be brought into and out of the beam path between the objective and eyepiece.

Description: The present invention relates to a field glass having means for alternative observation of additional information. Field glasses are already known in which additional information, such as direction, is superimposed on the image plane. The disadvantage of these known embodiments is that part of the image plane is permanently used for the additional information so that the total image plane can never be utilized for observing the primary information. Such field glasses are described for example in British patent no. 1 603 599 and German utility model no. 83 01 958. Field glasses are also known in which an LC (liquid crystal) information carrier permanently takes up the whole image plane. However, such devices have the disadvantage that they involve a considerable loss of light. European patent no. 170 655 also describes a means for reflecting additional information into a field glass. The additional information is additionally superimposed on the beam path. The disadvantage here is the technically elaborate and voluminous construction. DE-A-1 923 688 discloses a field glass having a plate behind the reticle, which plate has an infra-red light receiving layer which is adapted to be brought into and out of the beam path between objective and eyepiece. US-A-4,838,672 discloses a field glass having a rotational plate with two windows which can be brought into and out of the beam path. One window is provided with the reticle in order to determine the distance to an object, the other window is equipped with a visibility diaphragm. The present invention is based on the problem of providing a field glass with which one can alternatively utilize the total image plane to observe the primary information, or visualize additional information. This problem is solved by a field glass according to claim 1. Only the version having an optical deflection means of the following examples is made according to the invention, the alternatives thereto are purely for information. The inventive field glass has the advantage that when the information carrier or information deflecting means is not brought in one obtains an optimally bright image covering the whole image plane. If desired, one can ask for additional information by bringing in the information carrier or information deflecting means. Since the information carrier or information deflecting means for the additional information can be brought out of the image plane it is advantageous, on the other hand, that the additional information can cover the whole image plane when the information carrier or information deflecting means is brought in. According to another preferred embodiment various additional information, e.g. direction, time, etc., can be asked for on an information carrier or by an information deflecting means. According to a further preferred embodiment a plurality of information carriers or information deflecting means can be provided which can be brought into the image plane alternatively and with various information. This also has the advantage that various information can be superimposed simultaneously or successively at various places in the image plane, e.g. at the top, bottom or sides. The term "field glass" refers here to monoculars and binoculars as well as to aiming telescopes and the like. The additional information brought in can be all types of information, for example direction, time, distance, temperature, cross-lines, maps. The information can be transmitted mechanico-optically, for example like the display of a mechanical compass via a suitable exposure and optical system. On the other hand the information can be transmitted electronically, for example by an electronic compass or an electronic clock. The information carrier may be either an LC (liquid crystal) or an LD (light-emitting diode) display. These displays have the advantage that they can be brought directly into the beam path. For the LD display additional lighting can be provided. As information deflecting means one will primarily use prisms and mirrors, including semitransparent ones. The information carrier or information deflecting means can be brought in so as to cover the whole image plane or only part of it. It is possible to provide a plurality of information carriers or information deflecting means so they can be brought into the image plane. The information carriers or information deflecting means can be brought in by swiveling, tilting or sliding. For example they can be swiveled in using a turning knob. They can be brought in mechanically or electrically. The information carrier or information deflecting means is in any case inserted into the image plane. It is advantageous to make the additional information means replaceable. The invention shall be explained in more detail in the following with reference to drawings showing exemplary embodiments. Fig. 1 shows a longitudinal section of one half of the field glass with the information carrier swiveled out, Fig. 2 shows a longitudinal section of one half of the field glass with the information carrier swiveled in, and Fig. 3 shows a longitudinal section of one half of the field glass with the information deflecting means brought in. The half of the field glass shown in Fig. 1 comprises housing 2, prisms 3, diaphragm 7, eyepiece 5 and objective 12. The beam path is referred to as 4. Connecting means 9 lead from additional information means 8, which can work mechanically or electronically, to information carrier 6. Control sliding knob 11 is used to move information carrier 6 via connecting rod 1 in guide means 10, i.e. to swivel it into and out of the beam path. In Fig. 1 information carrier 6 is shown in the swiveled out state. Fig. 2 shows the same assembly as Fig. 1 but with information carrier 6 swiveled in. Fig. 3 shows a longitudinal section of one half of the field glass comprising housing 2, prisms 3, diaphragm 7, eyepiece 5 and objective 12. The additional information obtained in additional information means 8, which can work mechanically or electronically, is projected via additional optical system 16 onto information deflecting means 6', in this case a prism. Information deflecting means 6' is insertable into beam path 4 between objective 12 and eyepiece 5. Information deflecting means 6' is moved by control push-button 12 which acts on information deflecting means 6' via transmitting swing rod 15 and holding means 13 which is displaceable in guide means 10. Number 14 refers to a tension spring. The figure shows information deflecting means 6' in the inserted state.

Claims: A field glass having means for optionally displaying additional information in the beam path (4) between objective and eyepiece (5), said field glass having additional information signal generating means (8) provided within the housing (2) of the field glass, at least one optical deflecting means (6') deflecting the additional information displayed by display means connected to the additional information signal generating means (8) in the direction of the eyepiece (5), which optical deflecting means (6') is disposed within the housing (2) of the field glass and adapted to be brought into and out of the beam path (4) between objective and eyepiece (5) via a control knob (12) disposed on the outside of the housing (5) of the field glass. The field glass of claim 1, wherein the optical deflecting means (6') is adapted to be brought into the beam path (4) between objective and eyepiece (5) to cover the whole image plane. The field glass of claim 1 or 2, wherein various additional information can be observed in the beam path (4) between objective and eyepiece (5). The field glass of claims 1, 2 or 3, wherein a plurality of optical deflecting means (6') is provided which can be brought into the beam path (4) alternatively.

Inventors: SCHWAB KURT DR, SCHWAB, KURT, DR.
Applicants: SWAROVSKI & CO, D. SWAROVSKI & CO.
Application year: 1993
Main classification: G02B23
IPC codes: G02B23