JPS62105115A - Image shifting device - Google Patents

Abstract

PURPOSE:To make the titled device small in size, and to realize a high speed response by arranging plural deflecting elements which can turn around at least one direction, based on a driving signal, and also consist of a transmission body. CONSTITUTION:By driving of a piezoelectric element 22, supporting rods 2, 8 and connecting rods 10a, 10b... are turned as one body around a Y direction of the turning center of the supporting rod 2 against a tensile force of a spring 30 or by the tensile force, and transmission bodies 14a, 14b... on placing bases 12a, 12b... which have been provided on each connecting rod are also turned as one body around the Y direction. Also, by driving of a piezoelectric element 24, the supporting rod 8 is moved in the Y direction against a pressing force of a spring 26 or by the pressing force, the connecting rods 10a, 10b... are turned by the same angle around a Z direction centering around a connecting position to the supporting rod 2, and the transmission bodies 14a, 14b... on the placing bases 12a, 12b... providing at each connecting rod are also turned around the Z direction. Accordingly, a luminous flux which advances in an X direction and is made incident is shifted by a suitable distance in the Z direction and the Y direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image shifting device. An image shifting device is used in an optical system and has the function of shifting a light beam carrying image information.

[Conventional technology]

Image shifting devices commonly used in the past include those that shift optical flux by mechanically driving optical components such as parallel plates, mirrors, prisms, and lenses, and those that use a combination of electro-optic crystals and birefringent materials. A device that shifts the luminous flux by separating ordinary rays and extraordinary rays has been used.

FIG. 6 is a diagram showing a schematic configuration of a two-dimensional image shifting device using parallel plates.

In the figure, 52 is an input image, 54 is an imaging lens, 56 is a first light-transmitting parallel plate, and 58 is an input image for rotating the parallel plate around the axis in the Y direction. 60 is a second light-transmitting parallel flat plate, 62 is a driving motor for rotating the parallel flat plate around the lx direction, and 64 is a two-dimensional light receiving element array. The light emitted from the input surface image 5201 points is focused by the imaging lens 54 and then focused by the first and second parallel flat plates 56.
．． 60 and is imaged onto a light receiving element array 64. This image formation position differs depending on the rotational positions of the first and second parallel plates. That is, as shown in FIG. 7, even for the same incident light beam 68, the imaging position on the light-receiving element array 72 changes as shown by solid lines and dotted lines depending on the inclination of the parallel plate 70. In the apparatus shown in FIG. 6, the first parallel plate 56''i is rotated at an appropriate angle around an axis in the Y direction, and the second parallel plate 60t is rotated at an appropriate angle around an axis in the X direction to form a light receiving element array. It is possible to form an image at any position on 64.

FIG. 8 is a diagram showing a schematic configuration of an image shift device using an electro-optic crystal and a birefringent material.

In the figure, 74 is 880% LiNbO3, KDP, P
A first electro-optic crystal such as LzT, 76 and 78 are transparent electrodes made of ITO attached to both sides of the crystal, 80 is a first birefringent material such as calcite, and 82
is the second electro-optic crystal similar to 74, and 84.86
are transparent electrodes similar to 76 attached to both sides of the crystal,
88 is a second birefringent material similar to 80 but half as thick. Thus, by appropriately adjusting the voltage applied to the crystal, the linearly polarized light 90 incident on the first electro-optic crystal 74 exits the crystal and enters the first birefringent material 80 to form an ordinary ray 92 or In order to form the extraordinary ray 94, the linearly polarized light incident on the second electro-optic crystal 82 after exiting the material is transferred to the second birefringent material after exiting the crystal by appropriately adjusting the voltage applied to the crystal. 88 and output the material as ordinary ray 96 or extraordinary ray 98° and ordinary ray 100 or extraordinary ray 102, respectively. In this way, the incident light can be shifted by adjusting the voltage applied to the electro-optic crystal 74, 82, and the number of stages of shifting can be further increased by making the combination of the electro-optic crystal and the birefringent material more multi-stage. can be done.

[Problem that the invention seeks to solve]

However, since the image information shifting device as shown in FIG. 6 is used to collectively shift the image information light flux onto a parallel plate, it is necessary to take up a considerably large rotation space for the parallel plate. A fairly large drive motor is also required. For this reason, there have been problems in that it is difficult to miniaturize the device, and it is also difficult to increase the operating speed.

In addition, in order to increase the number of stages of the image shift device handshaft as shown in FIG. 8, it is necessary to use all of the materials, making it difficult to miniaturize the device.

[Means to solve all problems]

According to the present invention, in order to solve all of the problems of the prior art, a plurality of deflection elements are arranged, each of which is rotatable in at least one direction based on a drive signal and is made of a transparent material. A one-image shifting device is provided.

〔Example〕

The following is a specific embodiment of the present invention with reference to the drawings. explain.

FIG. 1 is a partially omitted plan view showing a first embodiment of the apparatus of the present invention, and FIG. 2 is a partially omitted front view thereof.

In FIGS. 1 and 2, 2 is a first support rod;
The support rod has a cylindrical shape and extends in the Y direction. Both ends of the support rod 2 are held by a holder 4.degree. 6 so as to be rotatable only in the 9Y direction. On the other hand, 8 is a second support rod, which also has a cylindrical shape and extends in the Y direction. A plurality of connecting rods 10a, 10b, . . . are interposed between the two support rods 2, 8,
Each connecting rod extends in the hx direction. One end of the connecting rod lQa is connected to the support rod 2 so that it can rotate in two directions, and the other end of the connecting rod 10a is connected to the support rod 8 so that it can rotate in two directions. It is connected to the. The other connecting rods 10b, . . . are similarly connected to the support rods 2, 8.

A mounting plate 121L is attached approximately at the center of the connecting rod 1Oa. The mounting plate fl exists in a plane parallel to the X-Y plane, and is projected in the Y direction. The mounting plate 12
A transmitting body 14a, which is a light deflecting element, is fixed on the upper surface of m. The transparent body is made of a translucent material such as plastic or glass and has the shape of a parallel plane plate. That is, both of the two surfaces of the transparent body 148 exist within a plane parallel to the Y-Z plane, and the mounting surface is an optical surface.

Similarly, mounting plates 12b, . . . are attached to approximately the centers of the other connecting rods 10b, . . . , and similar transparent bodies 14b, . has been done.

A pedestal 16 is attached to the lower side of the support rod 8, and pedestals 18, 20 are attached to both ends of the support rod 8. Each of the pedestals has a circular plane plate shape, and the pedestal 16 exists in a plane parallel to the X-Y plane, and the pedestal 18.2
0 exists in a plane parallel to the X-2 plane.

A laminated piezoelectric element 22 serving as an actuator is brought into contact with the central portion of the lower surface of the pedestal 16 . The working end of the piezoelectric element in contact with the pedestal 16 is driven by a drive means (not shown) and is moved in two directions. A laminated piezoelectric element 24 serving as an actuator is brought into contact with the right side of the pedestal 18 . The working end of the piezoelectric element in contact with the pedestal 18 is driven by a driving means (not shown) to move in the Y direction. A compression spring 26 is brought into contact with the left side of the pedestal 20.

Furthermore, an extension spring 30 is attached to the support rod 8 and extends downward.

Note that the holders 4 and 6, the piezoelectric elements 22 and 24, and the spring 2
6.28 are both attached to a frame (not shown).

In the device of this embodiment as described above, the piezoelectric element 22t-
By driving, the support rods 2, 8 and the connecting rod 10a,
10b, . . . are rotated by one weight around the rotation center (Y direction) of the support rod 2 against or by the tensile force of the spring 30, and are thus attached to each connecting rod. The mounting table 12a is

The transparent bodies 14a, 14b, . . . above 12b, . . . are also Y
It can be rotated integrally around the direction. Also.

By driving the piezoelectric element 24, the support rod 8
A connecting rod 10a is moved in the Y direction against or by the pressing force of 6, and has one end connected to the support rod 8.

10b, . . . are all rotated by the same angle in two directions around the connection position with the support rod 2, and thus the mounting table 12 is attached to each connecting rod.
&, 12b, . . . Transparent body 14a above.

14b, . . . are also rotated in two directions.

Therefore, in this embodiment, the transparent bodies 14a and 14b are formed by appropriately driving the piezoelectric elements 22 and 24.

. . . i It can be rotated by desired angles around the Y direction and around the two directions, respectively, and thus the light beam advancing and incident in the X direction is shifted by an appropriate distance in the two directions and the Y direction.

FIG. 3 is a partially omitted plan view showing a second embodiment of the apparatus of the present invention, and FIG. 4 is a partially omitted front view thereof. In FIGS. 3 and 4, the same members as in FIGS. 1 and 2 are given the same reference numerals, and the explanation of these K will be omitted here.

In this example, each connecting rod 10m, 10b.

... is connected to the support rod 2 as in the first embodiment, but the other end of each connecting rod is connected to the independent support rods ga, 8b, ... in one direction in two directions. It is rotatably connected to the

A pedestal 16a is attached to the lower side of the support rod 8a, and pedestals 18a and 20a are attached to both ends of the support rod. Each of the pedestals 16a+18a and 20a n has the same structure as the pedestals 16, 18, and 20 of the first embodiment. Piezoelectric elements 22a, 24a and compression/manage 26a are brought into contact with the pedestals 16a, 18a, 20a, respectively. The piezoelectric element 22a.

24a and compression spring 26ai have the same configuration as the piezoelectric element 22.24 and compression spring 26 of the first embodiment. Furthermore, an extension spring 30a is attached to the support rod 8a.
This spring has the same structure as the extension spring 30 of the first embodiment. The piezoelectric elements 22a, 24a and the pins 26m, 30a are all attached to a frame (not shown).

The support bars 8b, . . . are also provided with pedestals 16b, 18b, 20b, .

24b, . . . and compression springs 26b, .

According to the apparatus of this embodiment as described above, each of the transparent bodies 14a,
14 b , ... can be independently rotated at desired angles around the Y direction and around the two directions, so the light flux advancing in the X direction is independent for each part of the light flux incident on each transmitting body. is shifted by an appropriate distance in two directions and in the Y direction.

FIG. 5 is a partially omitted front view showing a third embodiment of the device of the present invention. In FIG. 5, the same members as in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted here.

This embodiment substantially corresponds to the device of the first embodiment described above, in which a plurality of stages are arranged in parallel in the 2z direction. however.

In this embodiment, each stage of support rods 8 is connected to a connecting body 32.3.
4 are connected to each other. The connecting body is connected to the support rod 8 of each stage so that it can rotate around the Y direction but cannot slide in the Y direction. In addition, the support rod 8 is not provided with a pedestal 16°18.20 except for the bottom row,
Piezoelectric elements 22, 24 . The compression spring 26 is not brought into contact with the support rod 8, and the extension spring 30 is not attached to the support rod 8.

According to the device of this embodiment as described above, the piezoelectric elements 22, 24
By driving appropriately, it can be moved in the two-dimensional direction of Y-Z)
All of the transmitters arranged in an IJ sock shape can be rotated at the same desired angle in the iY direction and in two directions at the same time, thus transmitting a light beam with a large cross-sectional shape at an appropriate distance in the z direction and the Y direction. It can be shifted.

As another embodiment of the present invention, the apparatus of the first embodiment may be arranged in parallel in a plurality of stages in two directions, and each stage is driven independently.

Further, as another embodiment of the present invention, is the device of the second embodiment described above? An example is one in which a plurality of stages are arranged in parallel in two directions and each stage is driven independently. According to this embodiment, all the transparent bodies arranged in a matrix in the Y-Z two-dimensional direction can be driven independently. Then, it becomes possible to independently shift the image in two dimensions in any region of the image.

In the above embodiment, a piezoelectric element and a spring are used as the drive source for the deflection element, but it is also possible to use a wrist motor instead of these.

〔Effect of the invention〕

According to the present invention as described above, image shifting can be performed by forming each transmitting body relatively small and driving the transmitting body, so that a large space is not required for driving, and The means for this purpose do not need to be very large, and therefore the device can be made smaller and can achieve high-speed response.

[Brief explanation of drawings]

FIG. 1 is a partially omitted plan view of the apparatus of the present invention, and FIG. 2 is a partially omitted front view thereof. FIG. 3 is a partially omitted plan view of the device of the present invention. FIG. 4 is a partially omitted front view. FIG. 5 is a partially omitted front view of the apparatus of the present invention. 6 and 8 are block diagrams of a conventional image shifting device, and FIG. 7 is an explanatory diagram of the operation of the device shown in FIG. 6. 2.8: Support rod, 4, 6: Holder, 10a, 10b: Connecting rod, 121L, 12b: Mounting plate, 14a, 14b: Transparent body, 16.1B, 20: pedestal, 22.24: Piezoelectric Element, 26.30... Spring, 32.34: Connector. Agent Patent Attorney Jo Taira Yamashita Figure 4 Figure 7 Figure 8

Claims (5)

[Claims] (1) An image shift device comprising a plurality of deflection elements arranged in a transparent body and rotatable in at least one direction based on a drive signal. (2) The image shifting device according to claim 1, wherein the deflection elements are regularly arranged in a direction substantially perpendicular to the rotation axis. (3) The image shifting device according to claim 2, wherein the deflection elements are regularly arranged also in the direction of the axis of rotation thereof. (4) The image shifting device according to claim 1, wherein the deflection element is rotatable in two directions. (5) The image shifting device according to claim 1, wherein the transparent body has a parallel plane plate shape.