JPS5932033B2 - industrial tv camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an industrial television camera, and more particularly to an industrial television camera in which the opening area of a side viewing window and a reflector for changing the field of view can be reduced.

An industrial television camera that can change the field of view without moving the optical axis of the lens is configured as shown in FIG. 1, for example.

That is, in the same figure, numeral 1 indicates a camera case,
A lens 2 and an image pickup tube 3 are disposed coaxially within the camera case 1, and a side scope 5 held by a rotating shaft 4 is disposed on the optical axis of the lens 2 on the object side. and,
A target object is observed through a side viewing window 6 and a side viewing mirror 5 opened on the side surface of the camera case 1. To change the field of view, as shown in FIG. 2 or 3, the rotation shaft 4 is rotated in the direction of the arrow in FIG. 1. However, the side scope 5
In an industrial television camera of the type that changes the field of view by rotating the side mirror 5, the light beam incident on the lens 2 moves on the side viewing window 6 as the side viewing mirror 5 rotates, so a large side viewing window is required. In addition, since the angle of incidence of the light beam on the side scope 5 may be large, a large side scope is also required (see Figure 2).
.

Therefore, the large side mirror and side viewing window are an obstacle in narrow-area observation television cameras and the like that are required to be compact. Furthermore, a television camera with a rotating side mirror has the disadvantage that it is difficult to use a wide-angle lens. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned disadvantages and reduce the opening area of the side view window to achieve miniaturization.
We are able to provide industrial TV cameras. An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. In FIG. 4, reference numeral 7 indicates a mirror holding plate, and this mirror holding plate 7 is placed in the camera case 1 on the object side of the lens 2, in line with the optical axis of the lens, and blocks the light beam incident on the lens 2. It is arranged so that it does not occur.

Two guide grooves 8, 8 for guiding a side mirror 5, which will be described later, are opened in the mirror holding plate 7. On the other hand, support shafts 9 are protruded from both ends of the side edge of the side scope 5 facing the mirror holding plate 7, and each support shaft 9 allows the reflective surface of the side scope 5 to be The guide grooves 8, 8 are engaged with each other in a corresponding relationship such that they are opposed to the guide grooves 8, 8.

Note that each support shaft 9 is engaged with the guide groove 8 so that it can freely move along the guide groove without moving in the width direction. For this purpose, it is possible to fit a rolling roller to the support shaft 9. When the support shaft 9 is engaged with the guide groove 8 as described above, the side scope 5 changes the inclination of the lens with respect to the optical axis along the trajectory determined by the guide groove 8, and changes the distance from the lens. They will be guided so that they can move while being guided.

Since the spacing between the support shafts 9, 9 protruding from the side edge of the side scope 5 is constant, the movement trajectory of the side scope 5 and the attitude of the lens with respect to the optical axis during movement are uniquely determined. Become. In the present invention, the positions and shapes of the guide grooves 8, 8 are such that the reflected image of the lens 2 by the side scope 5 is approximately the same as that of the side viewing window 6, no matter where the side scope 5 is on the movement locus. It is set so that it can be observed from the center, that is, so that the light ray passing through the optical axis of the lens 2 passes through approximately the center of the side viewing window 6. There are an infinite number of pairs of guide grooves 8, 8 as described above.
In order to guide the side scope 5 more reliably and smoothly, two mirror holding plates 7 may be used to guide both side edges of the side scope 5.

On the other hand, one of the edges of the side scope 5 parallel to the support shaft 9 (in the illustrated embodiment, the upper support shaft 9) is connected to a tension coil spring 11.
The connecting rod 12 is biased in one direction (to the left in the illustrated embodiment) by the connecting rod 12 on the other edge parallel to the spindle 9 (lower spindle 9 in the illustrated embodiment). one end of which is linked.

The other end of the connecting rod 12 is connected to a piston 14 of a linear actuator 13, such as a hydraulic cylinder. The cylinder head of the linear motion attituent 13 is rotatably supported by, for example, the camera case 1. In addition, in FIG. 4, the parts with the same symbols as in FIG. 1 correspond to the same parts as in FIG. 1. The industrial television camera according to the present invention configured as described above expands and contracts the piston 14 of the linear actuator 13 when changing the field of view.

The piston 14 is extended and contracted via the connecting rod 12 to the side scope 5.
The signal is transmitted to a support shaft 9 protruding from the side edge of the support shaft 9, which is driven along the lower guide groove 8. Then, the driving force of the piston 14 is transmitted to the support shaft 9 that is engaged with the upper guide groove through the main body of the side scope 5, and the support shaft 9 engages with the upper guide groove, and is moved against the biasing force of the tension coil spring 11. It is pulled along the upper guide groove. The tension coil spring 11 acts to smooth the movement of the side scope 5 when the piston 14 is extended.

Furthermore, since the linear actuator 13 can swing, there is no risk of excessive side pressure being applied to the piston 14 when it expands or contracts. In this way, as shown in FIG. 5, the side scope 5 is positioned at the position indicated by the solid line for observing in a direction perpendicular to the optical axis of the lens 2, and at the outermost observation position of the variable field of view indicated by the dotted line or chain line. , or any position between these, the inclination of the lens 2 with respect to the optical axis is gradually changed. As described above, since the light ray passing through the optical axis of the lens at any position of the side scope passes approximately through the center of the side scope, the industrial television camera according to the present invention can change the lens position depending on the tilt of the side scope 5. The central axis of the light beam can be tilted while preventing the light beam incident on the side viewing window 6 from moving significantly on the side viewing window 6. That is, it is possible to convert the field of view.
Although the optical path length between the lens 2 and the object to be observed changes slightly due to the movement of the side scope 5, the amount of change is extremely small, so there is no need to adjust the lens focusing device.
As is clear from the above description, the present invention changes the field of view by changing the position and orientation of the side view window so that the light rays passing through the optical axis of the lens always pass through approximately the center of the side view window. The light beam incident on the person hardly moves along the side viewing window.

Therefore, the opening area of the side viewing window can be made much smaller compared to the conventional industrial television camera with a side viewing mirror, which facilitates the miniaturization of industrial television cameras with a side viewing function. This effect is remarkable in cylindrical industrial television cameras for area observation. Furthermore, if the openings of the side viewing windows are made the same size, it is possible to use a wider-angle lens than conventional ones, and a wider area can be observed, and various other effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic sectional view showing an example of the structure of a conventional industrial television camera, FIGS. 2 and 3 are diagrammatic sectional views showing the field of view conversion state, and FIG. FIG. 5 is a diagrammatic cross-sectional view of an industrial television camera according to an embodiment, and is a diagram showing the operation of its optical system. 1... Camera case, 2... Luns, 3
...Image tube, 5...Side scope, 6...
...Side view window, 7...Mirror holding plate, 8...
...Guide groove, 9...Spindle, 11...
Tension coil spring, 12... Connection rod, 13
...Linear actuator, 14...
piston.

Claims (1)

[Scope of Claims] 1. A camera case provided with a side view window on the side, a lens disposed within the camera case, an image pickup tube disposed coaxially with the focal side of the lens, and the camera case on the side. A side viewing mirror that reflects light rays entering the camera case from the viewing window toward the lens, wherein two guide grooves are opened in the camera case on the objective side of the lens, and the light from the lens is A mirror holding plate parallel to the axis is disposed so as not to block the light beam incident on the lens, and a support shaft is provided protruding from each side edge of the side scope opposite to the mirror holding plate, Each support shaft is engaged with a separate guide groove,
The two guide grooves guide the side scope so that it can move along the trajectory determined by the two guide grooves, and the two guide grooves are arranged so that the light ray passing through the optical axis of the lens passes through approximately the center of the side viewing window. An industrial television camera characterized in that the position and shape of the side mirror are determined and the side scope can be driven by an actuator. 2. The industrial television according to claim 1, wherein one end edge parallel to the support shaft of the side scope is biased in one direction, and the other end edge can be driven by an actuator. camera.