JPH0580140A - Photographing device - Google Patents

Abstract

PURPOSE:To lessen the requisite area of an optical window, increase the mechanical strength, and suppress the costs by rotating the optical system and image surface with a rotating mechanism, and putting them in parallel movement using a slide mechanism. CONSTITUTION:Moving the view direction axis of a photographing device is managed with a lesser requisite area of optics 2 by controlling the optical system 3 and image surface 4 with a rotary shaft 6 and a slide mechanism 7. The control of rotating mechanism 6 and slide mechanism 7 is made so that the relationship LY=-LH tantheta+C is always maintained, where LH is distance between the slide mechanism parallel motion shaft and the optical window, thetais angle between the horizontal axis perpendicular to the parallel motion shaft and the viewing axis of the optical system, LV is distance of any arbitrary point on the parallel motion axis from the rotational center, and C is a constant. The relationship DW=DL/CosthetaMAX holds approximately, where DL is dia. of light pencil incident to the optical system, DW is the window length in the direction along the optical system view direction axis, and thetaMAX is maximum value of theta. From these two equations, the size of the optical window can be achieved below one half.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus which scans a visual axis as an image pickup apparatus by controlling a visual axis of an optical system by a rotating mechanism.

[0002]

2. Description of the Related Art FIG. 3 shows a configuration example of a conventional image pickup apparatus.
In the figure, 1 is a target object, 2 is an optical window, 3 is an optical system, 4 is an image plane, 5 is a rotation center, and 6 is a rotation mechanism.

Next, the operation will be described. The light reflected or emitted by the target passes through the optical window and enters the optical system. The optical system forms the incident light on the image plane. At this time, it becomes possible to scan the visual axis of the optical system by the rotating mechanism. At this time, the optical window needs to have a large area to some extent so as not to block the light beam incident on the optical system even when the visual axis of the image pickup device scans.

[0004]

Since the conventional image pickup apparatus is constructed as described above, as shown in FIG. 3, in order to deal with the case where the target is on the horizontal axis and both above and below. I had to enlarge the optical window. In general, the material of the optical window is inferior in mechanical strength to a structure such as metal, and may be destroyed in the worst case due to environmental conditions such as internal pressure, external pressure and vibration. Further, since the optical window does not adversely affect the luminous flux incident on the optical system, there is a problem that the larger the size of the optical window for polishing with extremely high precision, the more expensive it becomes.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an image pickup apparatus which realizes higher mechanical strength by reducing an optical window and further realizes low cost. , It is an object of the present invention to provide a relational expression for controlling the rotation mechanism and the slide mechanism in the image pickup device for that purpose.

[0006]

An image pickup apparatus according to the present invention rotates an optical system and an image plane by a rotation mechanism, and
The required area of the optical window is reduced by parallel movement by the slide mechanism.

Further, the distance between the parallel movement axis of the slide mechanism and the optical window is L _H , the angle between the horizontal axis perpendicular to the parallel movement axis of the slide mechanism and the sight axis of the optical system is θ, and the parallelism of the slide mechanism is parallel. When the distance between any one point on the moving axis and the center of rotation is L _V , the rotation mechanism and the slide mechanism are controlled so that the relationship of formula (2) described below is always maintained.

[0008]

The rotating mechanism of the present invention functions so as to scan the visual axis of the image pickup device.

Further, the value of θ of the slide mechanism is defined by the distance L _H between the parallel movement axis of the slide mechanism and the optical window, the horizontal axis perpendicular to the parallel movement axis of the slide mechanism, and the view axis of the optical system. When the angle is θ and the distance between any one point on the parallel movement axis of the slide mechanism and the rotation center is L _V , (2) described later
It is controlled so as to always satisfy the relation of the formula, and acts to reduce the required area of the optical window.

[0010]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, 1 is a target object, 2 is an optical window,
3 is an optical system, 4 is an image plane, 5 is a rotation center, 6 is a rotation mechanism,
7 is a slide mechanism.

1 and 2 show the case where the visual axis of the image pickup device is operated. Comparing both figures, by controlling the optical system 3 and the image plane 4 by the rotation mechanism 6 and the slide mechanism 7, the required area of the optical window 2 can be made small. The rotation mechanism 6 and the slide mechanism 7 are controlled by setting the distance L _H between the translation shaft of the slide mechanism and the optical window, and the angle between the horizontal axis perpendicular to the translation shaft of the slide mechanism and the sight axis of the optical system. _Let θ be the distance between any one point on the parallel movement axis of the slide mechanism and the center of rotation, and let L _V be the relationship of formula (2). Here, when the diameter of the light beam incident on the optical system is D _L and the length of the optical window 2 in the optical system viewing axis direction is D _W , the relationship of equation (3) substantially holds.

[0012]

[Equation 2]

[0013]

[Equation 3]

On the other hand, in the conventional image pickup apparatus, the relation of D _L and D _W is almost established. D as a concrete numerical value
_{When L} = 150, θ = −5 to 45 °, and L _H = 300, D _W is about 508 in the conventional image pickup device, whereas D _W is about 212 in the image pickup device according to the present invention, which is half or less. The optical window can be realized.

[0015]

[Equation 4]

[0016]

As described above, according to the present invention, the optical window can be made small by controlling the plane mirror by the rotating mechanism and the sliding mechanism, and the mechanical strength of the image pickup apparatus such as resistance to internal and external pressure and vibration resistance can be improved. There is an effect that it is possible to improve the image pickup apparatus and to obtain an image pickup apparatus at a lower cost.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an image pickup apparatus showing an embodiment of the present invention.

FIG. 2 is a diagram in which the view axis of the image pickup apparatus is operated by controlling the rotation mechanism and the slide mechanism of the plane mirror.

FIG. 3 is a configuration diagram of an embodiment of a conventional image pickup apparatus.

[Explanation of symbols]

 1 Target 2 Optical window 3 Optical system 4 Image plane 5 Rotation center 6 Rotation mechanism 7 Slide mechanism

Claims (1)

[Claims] 1. An optical window for transmitting light reflected or radiated by an external target, an optical system for condensing the light, and an image plane such as a film and a solid-state image sensor arranged at a condensing position. In the imaging device, a rotation mechanism that rotates the optical system and the image plane about a rotation center on the view axis of the optical system,
A slide mechanism for translating the rotating mechanism in parallel is provided. The distance between the parallel movement axis of the slide mechanism and the optical window is L _H , the horizontal axis perpendicular to the parallel movement axis of the slide mechanism, and the visual direction of the optical system. When the angle formed by the axis is θ and the distance between any one point on the parallel movement axis of the slide mechanism and the rotation center is L _V , the rotation mechanism and the above-mentioned rotation mechanism are set so as to always satisfy the relationship of the formula (1). An imaging device characterized by controlling a slide mechanism. [Equation 1]