DE2164683C3 - Optical image stabilization system - Google Patents

Description

di

Ni

Vi

1 3.08

0.056

2 0.5667 1.62041 60.2

0.4372

3 1.9373

0.112

4 -1.7284 1.66446 35.8

0.2703

5 -1.0749

0.048

6 18.153 1.6727 32.1

0.0652

7 -1.5144

0.0667

8 -0.5867 1.48749 69.8

0.03

9 00

0.03

10 0.667 1.67 57.3

0.00

11 0.667

0.133

12 oc 1.67 57.3

0.00

ι wherein the number of the plane, the radius of curvature ri, the spacing di, Ni the refractive index and Vi represents the color dispersion.

The invention relates to an optical image stabilization system with an imaging system for the Generation of an image.

There is already an optical image stabilization system known, which is shown in Fig. 1. A refractive device D ₀ has a variable Vcrtikalwinkel borrowed and a fixed end plane. It is arranged in front of a main imaging system L ₁ . The breaking device is not shown in detail. However, it can be either a liquid prism or a known pair of a plano-concave and a plano-convex lens, as described in US Pat. No. 3,253,525. F ₀ is the image plane, R _{0 is} a reference plane, O _{0 is} an optical axis of the imaging lens L ₀ , while P _{0 is} a fixed point. If the vertical angle of the refractive device is δ , the deviation angle shown in the figure (5 'with δ = δ ■ (η -η'} , where η is the refractive index of a prism, while ri is the refractive index of the same surrounding material, for example is of air. If «'= 1 and« = 2.0, then δ' - δ would be so

that the imaging focus can be determined.

However, many problems arise in manufacturing such a system. Due to the optical properties of the materials with a refractive index as high as 2.0 - these are very light. yellowish - there are further difficulties in practical use. On the other hand, when n <2 (n> 2), the pixel is shifted so that an external force must be applied to compensate for this shift, and the mechanism becomes complicated.

The invention is therefore based on the object of creating an effective image stabilization system, which enables the use of optical materials whose refractive indices are within the usual To lie wide. According to the invention, this object is achieved by the characterizing features of the main claim solved.

Advantageous further developments of the invention are evident from the subclaims.

The invention avoids the above-mentioned disadvantages without any external force must be exercised, with a stationary optical system in a deflection optical system is provided and at the same time an optical transformation system is provided in front of the stationary system becomes, so that an excess or a shortage of the deviation of the stationary system is compensated by the dioptric system. The invention is particularly advantageous for use as an image stabilization device in a camera and similar optical devices.

The invention provides an optical stabilization system so that even in the event of a die and / or oscillatory movement of the optical system, the image at a static object point not entangled or moved relative to the rotating and / or oscillating optical system is, but is fixed in contrast.

The invention fulfills the following conditions:

1. The entire optical system with the exception of part of an optical deviation system, i.e. a stabilized optical element, rotates around a point on the reference axis which is a point on the optical axis.

2. The deviation system has a refractive surface, which is opposite to the one mentioned Rotation is stabilized.

3. The deviation system has such refractive surfaces that they run parallel to each other when the angle between the reference axis and the optical axis becomes zero by the rotation, while when this angle of rotation becomes equal to Λ, the deviation from the parallels of those formed by the deviation system dioptric planes, el. h. the vertical angle formed by the two planes becomes equal to f>.

4. If the dioptric system is an afocal system, its magnification M is given by IMI = In = M '!, where the index of refraction of the material surrounding the deviation device is n' and the index of refraction of the immovable refractive surface in the deviation system is η .
5

The device used to stabilize the optical deviation system according to the invention is not shown in detail. However, this can be the usual facilities, such as pendulum or the gyro effect, can be used in a satisfactory manner.

The invention is to be explained in more detail with the aid of the drawing. It shows

F i g. 1 a known optical image stabilization system, FIG. La a sectional view along the The reference plane of Fig. Ib, while Fig. Ib is a Sectional view along the inflection plane of Fig. La is,

2 shows an optical B: ldstabi-

ao lisierungssystcm, whereby a refractive dioptric System is provided,

Fig. 3 is a sectional view of a practical embodiment of the invention, the data in the Table are given,

* 5 Fig. 4 is a sectional view through a modified one Embodiment of the invention.

The following explanations relate to an arrangement according to the invention, in which the excess amount or the shortfall in deviation for the optical system is compensated for by a deviation system which contains a stationary system that can be arranged stationary, the Compensation with an afocal dioptric converter system he follows.

2a and 2b show an embodiment in which the deviation system D ₁ , D _{2 is} a dioptric system. It shows the state in which the end planes of the deviation system are stationary planes while other parts have made a rotation by an angle ό about points P ₁ , P ₂ on the reference axis; /? ,, R ₂ , the same optical axes O ₁ , O _{2 are} retained. Furthermore, Fig. 2a shows the arrangement of important parts and the beam path when n <2 and 0 <Λί <1, while Fi g. 2 b shows the same when n> 2 and M> I. The enlargement of the converter is obtained according to condition 4, for ri = 1, while in the case η <2 a wide-angle converter C ₁ and in the case η > 2 a teleconverter

C _{9 is} used. L ₁ , L ₂ are main imaging systems, F ₁ , F ₂ are image planes.

Fig. 2c shows the state in which the first plane of the deviation system D _{3 is} a stationary plane, while the other parts have been rotated by the angle about a point P ₃ on the reference axis R ₃ , the same optical axis Ο _Λ being maintained . In this case the sign of the deviation is H ₁ . in the drawing opposite to the signs in the case of FIGS. 2a and 2b.

The enlargement of the converter C ₃ is therefore M- ■ - = ~ (n-n '), which is why M <0 when n>n' , so that, for example, an afocal Kcplcr converter can be used as converter C ₃ . In this case, the image is reversed from FIGS. 2a and 2b, whereby it can be erected by a prism or the like. F _n is an image plane of the imaging system L ₃ .

As explained above, in the invention

the refractive index of the deviation system accordingly any optical value can be selected. One such converter that has an afokalc Angular gain and the deviation corresponding to the selected refractive index can compensate, is placed in front of the deviation system, making the pixel easily and can be precisely defined so that it can be used in any optical medium, for example under Water, can lie.

The data of components of the in FIG. 3 shown Embodiments are included in the table.

Although the aforementioned Condition 3 is based on FIG It is assumed that two refractive surfaces are arranged in an imaging system for example, an arrangement can be made in which the immobile refractive surface is part of the Converter, as shown in FIG. 4, forms.

level 1 Krüm 3.08 0.667 OO distance Refractive Color No. mungs index dispersion 2 radius 0.5667 0.667 I. ri di Ni Vi 3 1.9373 0.056 4th -1.7284 1.62041 60.2 0.4372 5 -1.0749 0.112 6th 18,153 1.66446 35.8 0.2703 7th -1.5144 0.048 8th -0.5867 1.6727 32.1 0.0652 9 OO 0.0667 10 1.48749 69.8 0.03 11th 0.03 12th 1.67 57.3 0.00 0.133 1.67 57.3 0.00

The above data apply to an image field angle of 47 °, Fl: 2.5; M = 0.67 and for one focal length of the main imaging system of 1.0.

For this purpose 3 sheets of drawings

Claims (6)

Claims: 21 683 1. An optical image stabilization system with an imaging system for the generation of an image, characterized by an afocal converter which is arranged in front of the imaging system and which contains a first part which is supported so that it can be moved with the imaging system and a second part which is movable relative to the first part and the imaging system, the second part being mounted between the first part and the imaging system, and by stabilizing means to stabilize the second part relative to the movement of the first part and the imaging system, wherein the afocal converter contains an optical deviation device which has a member with a stabilized plane and the afocal converter has a magnification M = ± (; z - n ') , in which η is the refractive index of this member at the stabilized refractive plane in the optical deviation device and n 'is the refractive index of the surrounding medium and the converter providing an upright image if M <0 and an inverted image if M > · 0, so that a stationary image is retained even if the imaging system and the first part move relative to the second part . 2. Optical image stabilization system according to claim 1, characterized in that the optical deviation system defines a plurality of planes in the beam path of the incident light and that the second plane, calculated in the direction of the incident light, is stabilized and that the magnification M = + Oi - n ') is. 3. Optical image stabilization system according to claim 1, characterized in that the deviation device has a plurality of levels in the beam path of the incident light and that the first level of the deviation system, calculated from the direction of the incident light, is stabilized and that the magnification M = - {11 - ri) is. 4. Optical image stabilization system according to claim 1, characterized in that the optical deviation device comprises a plano-concave lens and a plano-convex lens, the Spherical surfaces have the same radii of curvature, and that the imaging system around the center of curvature is pivotable, the second part being said plano-convex Lens and the first part containing said plano-concave lens. 5. Optical image stabilization system according to claim 1, characterized in that the Converter contains a plurality of lenses, which are arranged in series in the light beam path to the imaging system are arranged, and that the last lens of the afocal converter is a plano-convex Contains lens, the Stabilisicrungseinrichlimg stabilizes the Planebenc of the last lens and said last lens has a radius of curvature and a center of curvature defines and wherein the optical imaging system is pivotable about the center of curvature of the convex spherical Level of the last lens is arranged. 6. Optical image stabilization system, characterized by the lenses specified below, which, with the exception of the last one, are held in such a way that they move together and can be pivoted to _{the center of curvature of the r u plane,}